deadbolt vs latch

deadbolt

noun
  • The part of the lock which is moved when the key is engaged. 

  • A kind of lock in which the bolt (moving portion) is held in position by the cylinder rather than by a spring and so cannot be retracted except by turning the cylinder. 

verb
  • To fasten or secure with a deadbolt. 

latch

noun
  • A lightweight lock to protect internal structures from being modified by multiple concurrent accesses. 

  • A breastfeeding baby's connection to the breast. 

  • A fastening for a door that has a bar that fits into a notch or slot, and is lifted by a lever or string from either side. 

  • An electronic circuit that is like a flip-flop, except that it is level triggered instead of edge triggered. 

verb
  • To catch; lay hold of. 

  • To close or lock as if with a latch. 

How often have the words deadbolt and latch occurred in a corpus of books? (source: Google Ngram Viewer )