n. [ NL. acromegalia, fr. Gr. 'a`kron point, peak + me`gas, mega`loy, big. ] (Med.) Chronic enlargement of many bones of the skeleton, especially bones of hands, feet and face; the condition is due to excessive secretion of growth hormone. [ 1913 Webster + AS ]

{ , a. [ Mega- + Gr. kefalh` head. ] (Biol.) Large headed; -- applied to animals, and to plants when they have large flower heads. [ 1913 Webster ]

‖n. [ NL., fr. Gr. me`gas great + ke`ras horn. ] (Paleon.) The Irish elk. [ 1913 Webster ]

n. [ Mega- + Gr. &unr_; lip. ] (Zool.) A leaf-cutting bee of the genus Megachilus. See Leaf cutter, under Leaf. [ 1913 Webster ]

n. [ Mega- + Gr. &unr_; world. ] See Macrocosm. Croft. [ 1913 Webster ]

n. [ Mega- + coulomb. ] (Elec.) A million coulombs. [ 1913 Webster ]

n. [ Mega- + Gr. &unr_; skin. ] (Zool.) Any one of several species of Old World blood-sucking bats of the genus Megaderma. [ 1913 Webster ]

n. [ Mega- + dyne. ] (Physics) One of the larger measures of force, amounting to one million dynes. [ 1913 Webster ]

n. [ Mega- + farad. ] (Elec.) One of the larger measures of electrical capacitance, amounting to one million farads; a macrofarad. [ 1913 Webster ]

pos>n. (Anat.) A large bone marrow cell not usually found in the circulating blood; it is regarded as the precursors of blood platelets; it is up to 100 μm in diameter, with a polyploid nucleus. Also referred to as megacaryocyte, megalokaryocyte, and thromboblast. [ WordNet 1.5 +PJC ]

adj. Of or pertaining to a megakaryocyte. [ WordNet 1.5 ]

n. [ Megalo- + erg. ] (Physics) A million ergs; a megerg. [ 1913 Webster ]

a. [ L. Megalesius, fr. Gr. Mega`lh the Great, a surname of Cybele, the Magna Mater. ] Pertaining to, or in honor of, Cybele; as, the Megalesian games at Rome. [ 1913 Webster ]

n. [ Mega- + alethoscope. ] An optical apparatus in which pictures are viewed through a large lens with stereoptical effects. It is often combined with the stereoscope. [ 1913 Webster ]

n. [ Mega- + -lith; cf. F. mégalithe. ] A large stone; especially, a large stone used in constructing ancient monuments. -- Meg`a*lith"ic a. [1913 Webster]

adj. Of or pertaining to megaliths or the period during which they were erected; as, megalithic monuments like Stonehenge. [ WordNet 1.5 ]

{ . [ Gr. me`gas, gen. mega`loy, great. ] Combining forms signifying: (a) Great, extended, powerful; as, megascope, megacosm. (b) (Metric System, Elec., Mech., etc.) A million times, a million of; as, megabyte, a million butes; megawatt, a million watts; megameter, a million meters; megafarad, a million farads; megohm, a million ohms. [ 1913 Webster +PJC ]

See Meg-. [ 1913 Webster ]

prop. n. A genus of giant salamanders; in some classifications included in the genus Cryptobranchus.
Syn. -- genus Megalobatrachus. [ WordNet 1.5 ]

{ ‖, n. [ NL. megalocephalia, fr. Gr. &unr_; having a large head. ] (Med.) The condition of having an abnormally large head; called also megacephaly. -- Meg`a*lo*ce*phal"ic a. [Webster 1913 Suppl.]

n. [ Megalo- + Gr. &unr_; a hollow vessel. ] (Physiol.) A large, flattened red blood cell corpuscle having no nucleus, twice the diameter of the ordinary red corpuscle, found in considerable numbers in the blood in profound anaemia. [ 1913 Webster ]

n. [ NL., fr. megalo- + mania. ] (Pathol.) A form of mental alienation in which the patient has grandiose delusions. [ 1913 Webster ]

adj. Suffering from megalomania. [ WordNet 1.5 ]

prop. n. A natural family consisting of the two-toed sloths.
Syn. -- family Megalonychidae. [ WordNet 1.5 ]

‖n. [ NL., from Gr. me`gas, mega`lh, great + 'o`nyx claw. ] (Paleon.) An extinct quaternary mammal, of great size, allied to the sloth. [ 1913 Webster ]

a. [ Megalo- + Gr. fwnh` voice. ] Having a loud voice. [ 1913 Webster ]

n. [ NL., fr. Gr. megalo`polis; me`gas, mega`lh, great + po`lis city. ] 1. A chief city; a very large cuity; a metropolis. [ 1913 Webster ]

2. A region in which the suburbs of several large cities merge to form one large predominantly urbanized area. [ PJC ]

n. [ NL., fr. Gr. me`gas, -a`loy, large + 'w`ps eye. ] (Zool.) 1. A larva, in a stage following the zoea, in the development of most crabs. In this stage the legs and abdominal appendages have appeared, the abdomen is relatively long, and the eyes are large. Also used adjectively. [ 1913 Webster ]

2. A large fish; the tarpum. [ 1913 Webster ]

n. [ Megalo- + Gr. psychh` soul, mind. ] Greatness of soul. [ Obs. & R. ] [ 1913 Webster ]

{ ‖ } n. [ NL. megalosaurus, fr. Gr. me`gas, mega`lh, great + say^ros lizard: cf. F. mégalosaure. ] (Paleon.) A gigantic carnivorous dinosaur, whose fossil remains have been found in England and elsewhere. [ 1913 Webster ]

n. [ Mega- + -meter: cf. F. mégamètre. ] (Physics) 1. An instrument for determining longitude by observation of the stars. [ 1913 Webster ]

2. A micrometer. [ R. & Obs. ] Knight. [ 1913 Webster ]

{ } n. [ Mega- + meter, metre, n., 2. ] In the metric system, one million meters, or one thousand kilometers. [ 1913 Webster ]

n. [ Mega- + ampère. ] (Elec.) A million ampères. [ 1913 Webster ]

n. [ Mega- + Gr. fwnh` voice. ] A device to magnify sound, or direct it in a given direction in a greater volume, as a very large funnel used as an ear trumpet or as a speaking trumpet. [ 1913 Webster ]

‖n. [ NL., from Gr. me`gas great + fyto`n plant. ] (Paleon.) An extinct genus of tree ferns with large, two-ranked leaves, or fronds. [ 1913 Webster ]

n. [ Mega- + Gr. poy`s, podo`s, foot. ] (Zool.) Any one of several species of large-footed, gallinaceous birds of the genera Megapodius and Leipoa, inhabiting Australia and other Pacific islands. Called also mound builder, scrub fowl, moundbird, and brush turkey. See Jungle fowl (b) under Jungle, and Leipoa. [ 1913 Webster ]

n. [ NL., fr. Gr. me`gas great + po`lis city. ] A metropolis. [ Obs. ] Sir T. Herbert. [ 1913 Webster ]

{ } a. Belonging, or pertaining, to Megara, a city of ancient Greece. [ 1913 Webster ]

Megarian school, or
Megaric school, a school of philosophy established at Megara, after the death of Socrates, by his disciples, and remarkable for its logical subtlety. [ 1913 Webster ]

n. [ Mega- + -scope: cf. F. mégascope. ] A modification of the magic lantern (projector), used esp. for throwing a magnified image of an opaque object on a screen, solar or artificial light being used. [ 1913 Webster ]

{ , a. 1. (Physics) Of or pertaining to the megascope or the projection upon a screen of images of opaque objects. (b) Enlarged or magnified; -- said of images or of photographic pictures, etc. [ Webster 1913 Suppl. ]

2. (Geol.) Large enough to be seen; -- said of the larger structural features and components of rocks which do not require the use of the microscope to be perceived. Opposed to microscopic. [ Webster 1913 Suppl. ]

a. [ Mega- + Gr. &unr_; sing, mark: cf. F. mégasème. ] (Anat.) Having the orbital index relatively large; having the orbits narrow transversely; -- opposed to microseme. [ 1913 Webster ]

{ }, n. See Bagasse. [ 1913 Webster ]

n. [ Gr. me`gas great + sqe`nos strength. ] (Zool.) One of a group which includes the higher orders of mammals, having a large size as a typical characteristic. [ 1913 Webster ]

a. (Zool.) Having a typically large size; belonging to the megasthenes. [ 1913 Webster ]

n. [ Gr. me`gas great + sto`ma mouth. ] (Zool.) One of a group of univalve shells, having a large aperture or mouth. [ 1913 Webster ]

{ ‖ } n. [ NL. megatherium, fr. Gr. me`gas great + qhri`on beast. ] (Paleon.) An extinct gigantic quaternary mammal, allied to the ant-eaters and sloths. Its remains are found in South America. [ 1913 Webster ]

n. [ Megatherium + -oid. ] (Paleon.) One of a family of extinct edentates found in America. The family includes the megatherium, the megalonyx, etc. [ 1913 Webster ]

n. [ Mega- + volt. ] (Elec.) One of the larger measures of electro-motive force, amounting to one million volts. [ 1913 Webster ]

n. [ Mega- + weber. ] (Elec.) A million webers. [ 1913 Webster ]

n. [ NL., fr. Gr. 'w^ me`ga, i.e., the great or long o. Cf. Mickle. ] 1. The last letter of the Greek alphabet. See Alpha. [ 1913 Webster ]

2. The last; the end; hence, death. [ 1913 Webster ]

“Omega! thou art Lord, ” they said. Tennyson. [ 1913 Webster ]

Alpha and Omega, the beginning and the ending; hence, the chief, the whole. Rev. i. 8. [ 1913 Webster ]

The alpha and omega of science. Sir J. Herschel. [ 1913 Webster ]