(Canada, US) A small nail-like tack with a slightly rounded head that can be pressed into place with light pressure from the thumb; used for hanging light articles on a wall or noticeboard.

(transitive) To fix or attach something with a thumbtack.

A keyboard that can be operated using only the thumbs.

plural of thumbprint

plural of thumbnail

Third-person singular simple present indicative form of thumbnail

A screw that can be turned with the thumb and fingers. / An instrument of torture used to crush the fingers. / (figuratively) A weakness that can be taken advantage of.

plural of thumby

(colloquial) Knitted hand or thumb mitts

simple past tense and past participle of thumbnail