n. A little hook; a hook.n. Specifically In anatomy, the hooked anterior end of the superior occipitotemporal cerebral convolution.n. In entomology, a little hook-like organ or process, generally one of a series; specifically, one of the minute horny hooks on the prolegs of many caterpillars.n. One of the pair of marks, [], used in writing and printing, now more commonly called brackets. See bracket, n., 4.n. A curved surgical instrument with a sharp hook, used to extract the fetus in the operation of embryotomy.n. In music, a note equal in length to half a minim or one fourth of a semibreve; a quarter note. See note.n. A piece of wood resembling a fork, used as a support in building.n. Milit., a peculiar arrangement of troops, in which they are drawn up in a line nearly perpendicular to the line of battle.n. In fortification, an indentation in the glacis of the covered way at a point where a traverse is placed.n. A singular opinion, especially one held by a person who has no special competency to form a correct opinion; an unusual and whimsical notion concerning a matter of fact or principle of action; a perverse or odd conceit.To play or sing in quick rhythm.n. In zoology, one of the slightly curved and notched bristles or chætæ common among Oligochæta, and serving probably as locomotor organs.n. Same as crocket.