definition of
thumb

[1] #1 thumb n. [pollex] the thick short innermost digit of the forelimb. wn

[2] #2 thumb v. [hitchhike, hitch] travel by getting free rides from motorists. wn

[3] #3 thumb n. the part of a glove that provides a covering for the thumb. wn

[4] #4 thumb v. [flick, flip, riffle, leaf, riff] look through a book or other written material; "He thumbed through the report"; "She leafed through the volume". wn

[5] #5 thumb n. [ovolo, quarter round] a convex molding having a cross section in the form of a quarter of a circle or of an ellipse. wn