Also found in: Dictionary, Thesaurus, Legal.
a point or small spot.
punctum cae´cum blind spot.
punctum lacrima´le (pl. punc´ta lacrima´lia), an opening of a lacrimal duct on the edge of the eyelid.
punctum prox´imum near point.
punctum remo´tum far point.
punc´ta vasculo´sa minute red spots that mark the cut surface of white matter of the brain.
the minute circular opening of the lacrimal canaliculus, on the margin of each eyelid near the medial commissure.
[lak′rimā′lē] pl. puncta lacrimalia
Etymology: L, punctum, prick, lacrima, tear
a minute circular aperture in the medial opening into the nasolacrimal sac. The puncta drain the tears that travel from the lacrimal glands through the lacrimal ducts to the conjunctiva. Puncta clogged with mucus or dirt cause irritation and discomfort.
A small, round or oval, opening of the lacrimal canaliculus (duct) on the margin of each eyelid near the inner canthus and situated in the middle of a small elevation the lacrimal papilla. A lacrimal punctum is normally visible only if the lid is everted. Plural: lacrimal puncta. Syn. lacrimal point.