• pin-hole

Frompin +‎hole.

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pinhole

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pinhole (pluralpinholes)

1. A smallhole, of a size that could have been made by apin
2. The aperture in apinhole camera orcamera obscura
   • 2012, Caspar Henderson,The Book of Barely Imagined Beings, page216:

     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) Aport leftunprotected by afirewall to allow a particularapplication to gain access to aservice.
4. (meteorology) Aclipping ofpinhole eye, which refers to the compacteye structure associated with intensetropical cyclones.

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

pinhole (third-person singular simple presentpinholes,present participlepinholing,simple past and past participlepinholed)

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

• lophine

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