pigeonhole window
noun
A small or recessed window resembling a pigeonhole; (also) a window with a small aperture through which transactions can take place.
Origin
Early 19th century; earliest use found in The Gentleman's Magazine.
- ionization gage
- ionization gauge
- ionization potential
- ionize
- ionizer
- ionizing potential
- ionizing radiation
- ionogen
- ionogenic
- ionogram
- ionographic
- ionography
- ionomer
- ionone
- ionopause
- ionophone
- ionophore
- ionophoresis
- ionophoric
- ionophorous
- ionosonde
- ionosphere
- ionospheric
- ionospherically
- ionosphericist