Vocabulary : Otoscopy to Otto engine

Otoscopy : The examination of the ear; the art of using the otoscope.
Otosteal : An auditory ossicle.
Otozoum : An extinct genus of huge vertebrates, probably dinosaurs, known only from four-toed tracks in Triassic sandstones.
Ottar : See Attar.
Ottava rima : A stanza of eight lines of heroic verse, with three rhymes, the first six lines rhyming alternately and the last two forming a couplet. It was used by Byron in "Don Juan," by Keats in "Isabella," by Shelley in "The Witch of Atlas," etc.

Ottawas : A tribe of Indians who, when first known, lived on the Ottawa River. Most of them subsequently migrated to the southwestern shore of Lake Superior.
Otter : Any carnivorous animal of the genus Lutra, and related genera. Several species are described. They have large, flattish heads, short ears, and webbed toes. They are aquatic, and feed on fish. Their fur is soft and valuable. The common otter of Europe is Lutra vulgaris; the American otter is L. Canadensis; other species inhabit South America and Asia. ;; The larva of the ghost moth. It is very injurious to hop vines. ;; A corruption of Annotto.
Otto : See Attar.
Otto cycle : A four-stroke cycle for internal-combustion engines consisting of the following operations: First stroke, suction into cylinder of explosive charge, as of gas and air; second stroke, compression, ignition, and explosion of this charge; third stroke (the working stroke), expansion of the gases; fourth stroke, expulsion of the products of combustion from the cylinder. This is the cycle invented by Beau de Rochas in 1862 and applied by Dr. Otto in 1877 in the Otto-Crossley gas engine, the first commercially successful internal-combustion engine made.
Otto engine : An engine using the Otto cycle.

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