pinhole /ˈpɪnˌhoʊl/noun 4verb 1forms 3 noun4 •A small hole, of a size that could have been made by a pin •The aperture in a pinhole camera or camera obscuraThese [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. — 2012 •A clipping of pinhole eye, which refers to the compact eye structure associated with intense tropical cyclones. •A port left unprotected by a firewall to allow a particular application to gain access to a service. verb1 •To form one or more pinholes in. formspinholed · pinholing · pinholes
