thumb
noun
°The short thick digit of the hand that for humans has the most mobility and can be made to oppose (moved to touch) all of the other fingers.
°(computing) The part of a slider that may be moved linearly along the slider.
verb
°To touch with the thumb.
°To turn the pages of (a book) in order to read it cursorily.
synonyms: pollex, thumby, browse, leaf more» , page, peruse