n. (1940) [ Bacillus + Margaret Tracy, (a child whose tissues contained Bacillus subtilis) + -in. RHUD. ] a polypeptide antibacterial antibiotic of known chemical structure effective against several types of Gram-positive organisms, and usually used topically for superficial local infection. It is produced by Bacillus subtilis and Bacillus licheniformis, and as produced commercially is composed of several closely related substances. The predominant component, Bacitracin A, has a formula C60H103N17O16S, and contains D-ornithine, D-phenylalanine and D-glutamine residues as well as the L-isomers of leucine, isoleucine, histidine, asparagine and aspartic acid. [ MI11 ] [ WordNet 1.5 ]

n. [ Gr. &unr_; a kind of fish. ] (Zool.) A shark of the genus Cestracion, and of related genera. The posterior teeth form a pavement of bony plates for crushing shellfish. Most of the species are extinct. The Port Jackson shark and a similar one found in California are living examples. [ 1913 Webster ]

a. (Zool.) Pertaining to, or characteristic of, the genus Cestracion. [ 1913 Webster ]

‖prop. n. [ NL., fr. Gr. 'ostra`kion small shell. ] (Zool.) A genus of plectognath fishes of the family Ostraciontidae having the body covered with solid, immovable, bony plates. It includes the trunkfishes (also called boxfish). [ 1913 Webster +PJC ]

n. (Zool.) A fish of the genus Ostracion and allied genera. [ 1913 Webster ]

v. t. Same as ostracize. [ Chiefly Brit. ] [ PJC ]

n. [ Gr. 'ostrakismo`s, fr. 'ostraki`zein to ostracize. See Ostracize. ] 1. (Gr. Antiq.) Banishment by popular vote, -- a means adopted at Athens to rid the city of a person whose talent and influence gave umbrage. [ 1913 Webster ]

2. Banishment; exclusion; as, social ostracism. [ 1913 Webster ]

Public envy is as an ostracism, that eclipseth men when they grow too great. Bacon. [ 1913 Webster ]

Sentenced to a perpetual ostracism from the . . . confidence, and honors, and emoluments of his country. A. Hamilton. [ 1913 Webster ]

n. (Paleon.) A fossil oyster. [ 1913 Webster ]

v. t. [ imp. & p. p. Ostracized p. pr. & vb. n. Ostracizing ] [ Gr. 'ostraki`zein, fr. 'o`strakon a tile, a tablet used in voting, a shell; cf. 'o`streon oyster, 'oste`on bone. Cf. Osseous, Oyster. ] 1. (Gr. Antiq.) To exile by ostracism; to banish by a popular vote, as at Athens. Grote. [ 1913 Webster ]

2. To banish from society, by a general consent; to exclude from social, political, or private favor; to exclude from conversation or friendship; to shun; as, he was ostracized by his former friends. A person may be ostracized by a formal vote or by a widespread but informal agreement. Marvell. [ 1913 Webster +PJC ]

a. [ Tetra + acid. ] (Chem.) Capable of neutralizing four molecules of a monobasic acid; having four hydrogen atoms capable of replacement ba acids or acid atoms; -- said of certain bases; thus, erythrine, C4H6(OH)4, is a tetracid alcohol. [ 1913 Webster ]

n. 1. The act of one who traces; especially, the act of copying by marking on thin paper, or other transparent substance, the lines of a pattern placed beneath; also, the copy thus producted. [ 1913 Webster ]

2. A regular path or track; a course. [ 1913 Webster ]

Tracing cloth,
Tracing paper, specially prepared transparent cloth or paper, which enables a drawing or print to be clearly seen through it, and so allows the use of a pen or pencil to produce a facsimile by following the lines of the original placed beneath. [ 1913 Webster ]