thumb

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n. innermost finger of the hand which moves in the opposite direction of the other fingers

The thumb is one of the five fingers.
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Thumb the radial or first digit of the hand. tennis thumb tendinitis of the tendon of the long flexor muscle of the thumb, with calcification. [more]Thumb - Community and Resources

Noun
1. the thick short innermost digit of the forelimb
(synonym) pollex
(hypernym) finger
(part-meronym) musculus abductor pollicis
(derivation) finger
2. the part of a glove that provides a covering for the thumb
(hypernym) covering
(part-holonym) glove, gloves
3. a convex molding having a cross section in the form of a quarter of a circle or of an ellipse
(synonym) ovolo, quarter round
(hypernym) molding, moulding
(hyponym) echinus
Verb
1. travel by getting free rides from motorists
(synonym) hitchhike, hitch
(hypernym) ride
2. look through a book or other written material; "He thumbed through the report"; "She leafed through the volume"
(synonym) flick, flip, riffle, leaf, riff
(hypernym) peruse
3. feel or handle with the fingers; "finger the binding of the book"
(synonym) finger
(hypernym) touch
(derivation) pollex

(v. t.)
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.
  

(v. t.)
To play with the thumbs, or with the thumbs and fingers; as, to thumb over a tune.
  

(v. t.)
To handle awkwardly.
  

(v. i.)
To play with the thumb or thumbs; to play clumsily; to thrum.
  

(n.)
The short, thick first digit of the human hand, differing from the other fingers in having but two phalanges; the pollex. See Pollex.