Punctum, plural puncta, adjective punctate, is an anatomical term for a sharp point or tip. It may also refer to:

Medical

Lacrimal punctum The lacrimal punctum (plural ''puncta'') or lacrimal point, is a minute opening on the summits of the lacrimal papillae, seen on the margins of the eyelids at the lateral extremity of the lacrimal lake. There are two lacrimal puncta in the medial ( ...

, a minute opening on the margins of the eyelids that collect tears produced by the lacrimal glands *

Blind spot (vision) A blind spot, scotoma, is an obscuration of the visual field. A particular blind spot known as the ''physiological blind spot'', "blind point", or ''punctum caecum'' in medical literature, is the place in the visual field that corresponds to t ...

, or ''punctum cecum'', the blind spot in human vision corresponding to the location of the optic disk * Erb's point (neurology) or ''punctum nervosum'', a nerve point in the human neck *

Imperforate lacrimal punctum An imperforate lacrimal punctum is a congenital disorder of dogs involving the lack of an opening to the nasolacrimal duct (tear duct) in the conjunctiva. Dogs normally have two lacrimal puncta, the superior and inferior. This condition can affect ...

, a congenital disorder of dogs

Unrelated species named punctum

*'' Allium punctum'', a species of wild onion *'' Amyna punctum'', a moth of the family Noctuidae *'' Cinguloterebra punctum'', a sea snail of the family Terebridae *'' Phylloxiphia punctum'', a moth of the family Sphingidae *'' Sepsis punctum'', a fly of the family Sepsidae *''

Zygaena punctum ''Zygaena punctum'' is a species of moth in the family Zygaenidae. It is found in Poland, the Czech Republic, Slovakia, Austria, Slovenia, Italy, the Balkan Peninsula, Moldova, Ukraine, Russia and Turkey. Technical description and variation (Seitz ...

'', a moth of the family Zygaenidae

Other

* ''Punctum'' (gastropod), a genus of land snails * Punctum delens, typographic marks used to indicate deletion * Neume, the basic element of Western and Eastern systems of musical notation prior to the invention of five-line staff notation *

Equant Equant (or punctum aequans) is a mathematical concept developed by Claudius Ptolemy in the 2nd century AD to account for the observed motion of the planets. The equant is used to explain the observed speed change in different stages of the plane ...

, punctum aequans, is a mathematical concept developed by Claudius Ptolemy in the 2nd century AD to account for the observed motion of heavenly bodies *A concept in the 1980 French philosophy book ''Camera Lucida'' *a medieval unit of time corresponding to a

Quarter-hour An hour (symbol: h; also abbreviated hr) is a unit of time conventionally reckoned as of a day and scientifically reckoned between 3,599 and 3,601 seconds, depending on the speed of Earth's rotation. There are 60 minutes in an hour, and 24 ho ...

*In photography, a term used by

Roland Barthes Roland Gérard Barthes (; ; 12 November 1915 – 26 March 1980) was a French literary theorist, essayist, philosopher, critic, and semiotician. His work engaged in the analysis of a variety of sign systems, mainly derived from Western popular ...

to refer to an incidental but personally poignant detail in a photograph * Punctate, a botanical term meaning marked with an indefinite number of dots, spots, pits or glands {{disambiguation