osculatoryA religious tablet, usually carrying a representation of Christ or the Virgin Mary, which is kissed by the priest during the Mass ("kiss of peace"); it is then passed to others at the mass who also kiss it.
osculatrixA curve whose contact with a given curve at a given point is of a higher order (or involves the equality of a greater number of successive differential coefficients of the ordinates of the curves taken at that point) than that of any other curve of the same kind.
osculometerAn instrument consisting of a series of arcs of known curvature, for comparison with other curves.
osculumOne of the suckers on the head of a tapeworm.
oseledetsA traditional Ukrainian male hairstyle consisting of a long loose tuft of hair at the top or front of an otherwise closely shaven head.
oseltamivirAn antiviral drug that is taken orally in the form of its phosphate C₁₆H₂₈N₂O₄·H₃PO₄ and is a neuraminidase inhibitor used in the treatment and prevention of influenza. It is a derivative of shikimic acid, and is marketed as Tamiflu.
osierA willow, of species Salix viminalis, growing in wet places in Europe and Asia, and introduced into North America, considered the best willow for wickerwork.
OskaloosaA city, the county seat of Mahaska County, Iowa, United States.
OskarsdottirA surname from Icelandic. (this is not a surname in Icelandic, it is merely a patronym in Iceland; it is adopted as a surname into English)
oskarssoniteA certain anhydrous aluminium fluoride mineral.
OskemenA city (population 300,000) on the Irtysh in east Kazakhstan.
OskilA river in Russia and Ukraine which arises roughly between Kursk and Voronezh and flows south to join the Seversky Donets.
osmanthusAny of several widely distributed evergreen flowering plants, of the genus Osmanthus, often used to create several liquors, jams, jellies, syrups, and teas.
osmanthusideAny of a group of phenolic glycosides present in Osmanthus fragrans.
OsmanyaA written script created to transcribe the Somali language.
OsmastonA locality in Meander Valley council area, northern Tasmania, Australia.
osmeriformOf the order Osmeriformes of ray-finned fish, characterised by having the maxilla in the gape of the mouth, radii absent from the scales, and loss of the basisphenoid and orbitosphenoid bones.
osmiumA chemical element (symbol Os) with atomic number 76: a hard, brittle, heavy, bluish-white transition metal found as a trace element in alloys, mostly in platinum ores.