v. i. or auxiliary. [ OE. moste, a pret. generally meaning, could, was free to, pres. mot, moot, AS. mōste, pret. mōt, pres.; akin to D. moetan to be obliged, OS. mōtan to be free, to be obliged, OHG. muozan, G. müssen to be obliged, Sw. måste must, Goth. gamōtan to have place, have room, to able; of unknown origin. ] 1. To be obliged; to be necessitated; -- expressing either physical or moral necessity; as, a man must eat for nourishment; we must submit to the laws. [ 1913 Webster ]

2. To be morally required; to be necessary or essential to a certain quality, character, end, or result; as, he must reconsider the matter; he must have been insane. [ 1913 Webster ]

Likewise must the deacons be grave. 1 Tim. iii. 8. [ 1913 Webster ]

Morover, he [ a bishop ] must have a good report of them which are without. 1 Tim. iii. 7. [ 1913 Webster ]

☞ The principal verb, if easily supplied by the mind, was formerly often omitted when must was used; as, I must away. “I must to Coventry.” Shak. [ 1913 Webster ]

v. t. & i. To make musty; to become musty. [ 1913 Webster ]

n. [ AS. must, fr. L. mustum (sc. vinum), from mustus young, new, fresh. Cf. Mustard. ] 1. The expressed juice of the grape, or other fruit, before fermentation. “These men ben full of must.” Wyclif (Acts ii. 13.). [ 1913 Webster ]

No fermenting must fills . . . the deep vats. Longfellow. [ 1913 Webster ]

2. [ Cf. Musty. ] Mustiness. [ 1913 Webster ]

n. [ F. moustac. ] (Zool.) A small tufted monkey. [ 1913 Webster ]

n.; pl. Mustaches [ Written also moustache. ] [ F. moustache, It. mostaccio visage, mostacchio mustache, fr. Gr. my`stax upper lip and the beard upon it; cf. ma`stax mouth: cf. Sp. mostacho. ] 1. That part of the beard which grows on the upper lip; hair left growing above the mouth. [ 1913 Webster ]

2. (Zool.) A West African monkey (Cercopithecus cephus). It has yellow whiskers, and a triangular blue mark on the nose. [ 1913 Webster ]

3. (Zool.) Any conspicuous stripe of color on the side of the head, beneath the eye of a bird. [ 1913 Webster ]

4. A stain or discoloration on the upper lip of a person; as, wearing a milk mustache. [ informal ] [ PJC ]

n.; pl. Mustachios A mustache. Longfellow. [ 1913 Webster ]

a. Having a mustache or mustachios.
Syn. -- mustached. [ 1913 Webster ]

n. [ Turk. & Ar. musta&hsdot_;fi&zsdot_; who trusts to another's keeping, a soldier of a garrison. ] See Army organization, above. [ Webster 1913 Suppl. ]

n. A close-grained, heavy wood of a brownish color, brought from Brazil, and used in turning, for making the handles of tools, and the like. [ Written also mostahiba. ] MaElrath. [ 1913 Webster ]

n. [ Sp. musteño belonging to the graziers, strayed, wild. ] (Zool.) The half-wild horse of the plains in Mexico, California, etc. It is small, hardy, and easily sustained. [ 1913 Webster ]

Mustard grape (Bot.), a species of grape (Vitis candicans), native in Arkansas and Texas. The berries are small, light-colored, with an acid skin and a sweet pulp. [ 1913 Webster ]