1. An inlet or entrance to a cavity or channel. in anatomy, an open gap or hole.
2. The diameter of the objective of a microscope. Syn: aditus [NA], apertura [NA], opening.
Origin
[L. apertura, an opening]
angular aperture
anterior nasal aperture
external aperture of cochlear canaliculus
external aperture of vestibular aqueduct
frontal sinus aperture
inferior pelvic aperture
inferior thoracic aperture
laryngeal aperture
lateral aperture of the fourth ventricle
aperture of mastoid antrum
medial aperture of the fourth ventricle
median aperture of the fourth ventricle
numerical aperture
aperture of orbit
sphenoidal sinus aperture
superior pelvic aperture
superior thoracic aperture