n. [ OE. thombe, thoumbe, þume, AS. þūma; akin to OFries. thūma, D. duim, G. daumen, OHG. dūmo, Icel. þumall, Dan. tommelfinger, Sw. tumme, and perhaps to L. tumere to swell. √56. Cf. Thimble, Tumid. ] The short, thick first digit of the human hand, differing from the other fingers in having but two phalanges; the pollex. See Pollex. [ 1913 Webster ]

Upon his thumb he had of gold a ring. Chaucer. [ 1913 Webster ]

Thumb band, a twist of anything as thick as the thumb. Mortimer. --
Thumb blue, indigo in the form of small balls or lumps, used by washerwomen to blue linen, and the like. --
Thumb latch, a door latch having a lever formed to be pressed by the thumb. --
Thumb mark. (a) The mark left by the impression of a thumb, as on the leaves of a book. Longfellow. (b) The dark spot over each foot in finely bred black and tan terriers. --
Thumb nut, a nut for a screw, having wings to grasp between the thumb and fingers in turning it; also, a nut with a knurled rim for the same perpose. --
Thumb ring, a ring worn on the thumb. Shak. --
Thumb stall. (a) A kind of thimble or ferrule of iron, or leather, for protecting the thumb in making sails, and in other work. (b) (Mil.) A buckskin cushion worn on the thumb, and used to close the vent of a cannon while it is sponged, or loaded. --
Under one's thumb, completely under one's power or influence; in a condition of subservience. [ Colloq. ] [ 1913 Webster ]

v. t. [ imp. & p. p. Thumbed p. pr. & vb. n. Thumbing ] 1. To handle awkwardly. Johnson. [ 1913 Webster ]

2. To play with the thumbs, or with the thumbs and fingers; as, to thumb over a tune. [ 1913 Webster ]

3. To soil or wear with the thumb or the fingers; to soil, or wear out, by frequent handling; also, to cover with the thumb; as, to thumb the touch-hole of a cannon. [ 1913 Webster ]

He gravely informed the enemy that all his cards had been thumbed to pieces, and begged them to let him have a few more packs. Macaulay. [ 1913 Webster ]

v. i. To play with the thumb or thumbs; to play clumsily; to thrum. [ 1913 Webster ]

n. The goldcrest. [ Prov. Eng. ] [ 1913 Webster ]

a. 1. Having thumbs. [ 1913 Webster ]

2. Soiled by handling. [ 1913 Webster ]

n. An instrument of torture for compressing the thumb; a thumbscrew. [ 1913 Webster ]

a. Without a thumb. Darwin. [ 1913 Webster ]

n. 1. A screw having a flat-sided or knurled head, so that it may be turned by the thumb and forefinger. [ 1913 Webster ]

2. An old instrument of torture for compressing the thumb by a screw; a thumbkin. [ 1913 Webster ]

n. The chiff-chaff. [ Prov. Eng. ] [ 1913 Webster ]

n. pl. [ Heb., pl. of thōm perfection. ] A mysterious part or decoration of the breastplate of the Jewish high priest. See the note under Urim. [ 1913 Webster ]