Pronunciation: [spˈa͡ɪhə͡ʊl] (IPA) 
The correct spelling of the word "spyhole" is with a Y, not an I. This can be seen in the IPA phonetic transcription, which shows that the Y sound is pronounced as /aɪ/ while the I sound is pronounced as /ɪ/. So, the correct pronunciation of the word should be /ˈspaɪhəʊl/ with the stress on the first syllable. It is important to use the correct spelling in written communication to avoid confusion and ensure clarity.
A spyhole refers to a small opening or peephole that is intentionally created in a door, wall, or other barrier, allowing one to discreetly observe or monitor activity on the other side without being detected. This term is commonly associated with surveillance or security purposes, as spyholes are often used to establish a covert or inconspicuous means of observing people or activities in a particular area.
Typically, spyholes are circular in shape, although they can also be rectangular or shaped differently depending on the context. Their diameter is usually small enough to prevent anyone on the other side from noticing the observer's presence. Spyholes are commonly made in doors, especially front doors of houses or hotel rooms, enabling individuals inside to discreetly identify visitors before granting them access. They are often equipped with a lens, such as a fish-eye lens, to provide a wide field of view.
The primary function of a spyhole is to facilitate observation while maintaining secrecy and privacy. By allowing a limited view through a controlled aperture, a spyhole enables the user to inspect or check the outside without raising suspicion or alerting potential subjects to their surveillance. Spyholes may also be utilized in various other contexts, including military tactics, espionage, building security, or even artistic installations where discreet observation or interaction is desired.
The word "spyhole" is derived from the combination of two English words: "spy" and "hole".
The term "spy" entered the English language in the 13th century from the Middle English word "spien", which means "to watch, discover, or explore secretly". It originated from the Old French word "espier" and ultimately traces back to the Latin word "spiare", meaning "to spy or watch over".
On the other hand, "hole" comes from the Old English word "hol", which refers to an opening or hollow space.
When combined, "spyhole" refers to a small opening or aperture that allows one to observe or spy on someone or something secretly, usually without being detected. The term is commonly used to describe a small opening in a door or wall through which one can look without being seen.
