os

An osar or esker.

Noun anatomy, biology

  1. An opening or entrance to a passage, particularly one at either end of the cervix, internal (to the uterus) or external (to the vagina).
    • The instrument closed, as seen in Fig. 1, is then passed along the finger to the os, in and through the cervix up to the fundus of the uterus, which may be determined both by the distance and the resistance to the broad...
    • […] monocolpate (“unisulcate”) pollen grains still have a continuous aperture membrane devoid of special openings (ora) in the exine for the emergence of the pollen tube. - 2009 July 6, Armen Takhtajan, Flowering...

    Synonyms: orifice

Origin

Unadapted borrowing from Latin ōs (“the mouth”).

Forms

ora

Noun anatomy, medicine

  1. Synonym of bone.
    • I was once, I remember, called to a Patient, who had received a violent Contuſion in his Tibia, by which the exterior Cutis was lacerated, ſo that there was a profuſe ſanguinary Diſcharge; and the interior Membranes...

    Synonyms: bone

Origin

Borrowed from Latin os (“a bone”).

Forms

ossa

Hyponyms

os breve os irregulare os longum os planum os sesamoideum

Derived

os capitatum os clitoridis os clitoris os cordis os coxae os cuneiforme os innominatum os magnum os paracuneiforme os penis os trapezoideum os trochleare calcanei

Noun Entry 3

  1. An osar or esker.

Origin

Etymology tree Swedish åsbor. English os Borrowed from Swedish ås.

Forms

osar

Noun alt of, alternative

  1. Alternative form of o's.

Origin

Etymology tree English o Old English -as Middle English -es English -s English os From o + -s.