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An oarlike swimming organ of various invertebrates. Oar cock (Zoöl), the water rail. [Prov. Eng.] -- Spoon oar, an oar having the blade so curved as to afford a better hold upon the water in rowing. -- To boat the oars, to cease rowing, and lay the oars in the boat. -- To feather the oars. See under Feather., v. t.…

Of or pertaining to obits, or days when obits are celebrated; as, obitual days. Smart.

rrounds the great foramen by which the spinal cord leaves the cranium. In the higher vertebrates it is usually composed of four bones, which become consolidated in the adult. -- Occipital point (Anat.), the point of the occiput in the mesial plane farthest from the ophryon.

A little eye; a minute simple eye found in many invertebrates.

A group of Mesozoic birds having the jaws armed with teeth, as in most other vertebrates. They have been divided into three orders: Odontolcæ, Odontotormæ, and Saururæ.

tory nerves; the olfactory cells. Olfactory organ (Anat.), an organ for smelling. In vertebrates the olfactory organs are more or less complicated sacs, situated in the front part of the head and lined with epithelium innervated by the olfactory (or first cranial) nerves, and sensitive to odoriferous particles conveyed…

of four years, by which the ancient Greeks reckoned time, being the interval from one celebration of the Olympic games to another, beginning with the victory of Coroebus in the foot race, which took place in the year 776 b.c.; as, the era of the olympiads.

e ancient Greeks, consisting of athletic games and races, dedicated to Olympian Zeus, celebrated once in four years at Olympia, and continuing five days.

ne of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates.

t is used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds produced at the open end of the tube, as by speaking or singing into it. A. E. Dolbear.

e finger; -- said of the string of an instrument, as of a violin, when it is allowed to vibrate throughout its whole length.

discourse having reference to some special occasion, as a funeral, an anniversary, a celebration, or the like; -- distinguished from an argument in court, a popular harangue, a sermon, a lecture, etc.; as, Webster's oration at Bunker Hill. The lord archbishop . . . made a long oration. Bacon.

To move backward and forward; to vibrate like a pendulum; to swing; to sway.

That oscillates; vibrating; swinging. Oscillating engine, a steam engine whose cylinder oscillates on trunnions instead of being permanently fixed in a perpendicular or other direction. Weale.

The act of oscillating; a swinging or moving backward and forward, like a pendulum; vibration.

Tending to oscillate; vibratory. [R.] I. Taylor.

r characterized by motion, backward and forward like a pendulum; swinging; oscillating; vibratory; as, oscillatory motion.

with strong field, in which the mass of the moving part is very small and frequency of vibration very high. -- Os`cil*lo*graph"ic (#), a.

A metamere of the vertebrate skeleton; an osteomere; a vertebra. Owen.

The science which treats of the bones of the vertebrate skeleton.