pinhole

• pin-hole

From pin +‎ hole.

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pinhole

Wikipedia

pinhole (plural pinholes)

1. A small hole, of a size that could have been made by a pin
2. The aperture in a pinhole camera or camera obscura
   • 2012, Caspar Henderson, The Book of Barely Imagined Beings, page 216:

     These [the eyes of the nautilus] are the simplest eyes of any large living animal -- lensless 'pinholes' that project a hazy and rather dim image onto its retinas.

3. (networking) A port left unprotected by a firewall to allow a particular application to gain access to a service.

• pinhole camera
• pinhole chert
• pinhole detector
• pinhole glasses
• pinhole grass
• pinhole pupil

pinhole (third-person singular simple present pinholes, present participle pinholing, simple past and past participle pinholed)

1. (transitive) To form one or more pinholes in.

• lophine