spy
Spy denotes:
- a person who espionage operates
- a built-in doors peephole (possibly with a lens), see peephole
- a small window in the outer wall of a building, see spy (construction technology)
- in the broadest sense also other optical devices (e.g. mirrors ) that allow unnoticed observation
- a tool to measure the width of a gap, see feeler gauge
See also:
Wiktionary: Spy - explanations of meanings, word origins, synonyms, translations