a door latch having a lever formed to be pressed by the thumb.
See also: Thumb
thumb latch
lift latch, thumb latch
lift latchA type of door latch which fastens a door by means of a pivoted bar that engages a hook on the doorjamb; a lever which lifts the pivoted bar is used to unfasten the door. Also see Norfolk latch, Suffolk latch, thumb latch.