n. [ L. alpha, Gr. 'a`lfa, from Heb. āleph, name of the first letter in the alphabet, also meaning ox. ] The first letter in the Greek alphabet, answering to A, and hence used to denote the beginning. [ 1913 Webster ]

In am Alpha and Omega, the beginning and the end, the first and the last. Rev. xxii. 13. [ 1913 Webster ]

Formerly used also denote the chief; as, Plato was the alpha of the wits. [ 1913 Webster ]

☞ In cataloguing stars, the brightest star of a constellation in designated by Alpha (α); as, α Lyræ. [ 1913 Webster ]

n. [ L. alphabetum, fr. Gr. &unr_; + &unr_;, the first two Greek letters; Heb. āleph and beth: cf. F. alphabet. ] 1. The letters of a language arranged in the customary order; the series of letters or signs which form the elements of written language. [ 1913 Webster ]

2. The simplest rudiments; elements. [ 1913 Webster ]

The very alphabet of our law. Macaulay. [ 1913 Webster ]

Deaf and dumb alphabet. See Dactylology. [ 1913 Webster ]

v. t. To designate by the letters of the alphabet; to arrange alphabetically. [ R. ] [ 1913 Webster ]

n. A learner of the alphabet; an abecedarian. Abp. Sancroft. [ 1913 Webster ]

{ } a. [ Cf. F. alphabétique. ] 1. Pertaining to, furnished with, expressed by, or in the order of, the letters of the alphabet; as, alphabetic characters, writing, languages, arrangement. English has an alphabetical writing system. [ 1913 Webster ]

2. Literal. [ Obs. ] “Alphabetical servility.” Milton. [ 1913 Webster ]

3. in alphabetical order.
Syn. -- abecedarian [ WordNet 1.5 ]

adv. In an alphabetic manner; in the customary order of the letters. [ 1913 Webster ]

n. The science of representing spoken sounds by letters. [ 1913 Webster ]

n. The expression of spoken sounds by an alphabet. Encyc. Brit. [ 1913 Webster ]

v. t. 1. To arrange alphabetically; as, to alphabetize a list of words. [ 1913 Webster ]

2. To furnish with an alphabet. [ 1913 Webster ]

adj. 1. of or pertaining to alphanumerics.
Syn. -- alphanumeric, alphameric, alphamerical [ WordNet 1.5 ]

2. (Computers) using or consisting of only alphabetical and numerical characters; -- contrasting with binary or control. alphanumeric characters
Syn. -- alphanumeric, alphanumerical, alphameric, alphamerical [ PJC ]

n. 1. a character set that includes letters and digits and punctuation marks. [ WordNet 1.5 ]

. (Photog.) A sensitized paper for obtaining positives by artificial light. It is coated with gelatin containing silver bromide and chloride. [ Eng. ] [ Webster 1913 Suppl. ]

. (Physics & Chem.) a particle emitted at high velocity from certain radioactive substances. It is identical to the helium nucleus, consisting of two protons and two neutrons. Rays of such particles are called alpha rays. [ Webster 1913 Suppl. +PJC ]

. (Physics & Chem.) Rays of relatively low penetrating power emitted by radium and other radioactive substances, and shown to consist of positively charged alpha particles (helium nuclei) having enormous velocities but small masses. They are slightly deflected by a strong magnetic or electric field. Compare beta ray and gamma ray. Because the rays penetrate only a small distance in dense matter such as living tissue, small pellets of radioactive substances emitting alpha rays have been used to cause local destruction of tissue, as in cancer therapy. [ Webster 1913 Suppl. +PJC ]

n. An alphabet of signs made by movement of the hands, used by the deaf; in it letters are represented by finger positions. See Dactylology.
Syn. -- finger alphabet. [ WordNet 1.5 ]

same as Morse code. [ 1913 Webster ]

‖n. [ NL., fr. Gr. &unr_;: cf. F. pentalpha. See Penta-, and Alpha. ] A five-pointed star, resembling five alphas joined at their bases; -- used as a symbol. [ 1913 Webster ]

. An alphabet for the blind with a system of raised points corresponding to letters. [ Webster 1913 Suppl. ]