de·tent /ˈdiˌtɛnt, dɪˈ/
De·tent n. Mech. That which locks or unlocks a movement; a catch, pawl, or dog; especially, in clockwork, the catch which locks and unlocks the wheelwork in striking.
n : a hinged catch that fits into a notch of a ratchet to move a
wheel forward or prevent it from moving backward [syn: pawl,