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One of the ridges of sand or gravel found in Sweden, etc., supposed by some to be of marine origin, but probably formed by subglacial waters. The osar are similar to the kames of Scotland and the eschars of Ireland. See Eschar.

An ornamental tree of the genus Maclura (M. aurantiaca), closely allied to the mulberry (Morus); also, its fruit. The tree was first found in the country of the Osage Indians, and bears a hard and inedible fruit of an orangelike appearance. See Bois d'arc.

A tribe of southern Sioux Indians, now living in the Indian Territory.

Hosanna. [Obs.] Chaucer.

See 3d Os.

Of or pertaining to the Osci, a primitive people of Campania, a province of ancient Italy. -- n.

The state of oscillating; a seesaw kind of motion. [R.]

ater algæ, the threads of which have an automatic swaying or crawling motion. Called also Oscillatoria.

fluctuating manner; to change repeatedly, back and forth. The amount of superior families oscillates rather than changes, that is, it fluctuates within fixed limits. Dc Quincey.

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.

A current alternating in direction.

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

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

Any device for producing electric oscillations; esp., an apparatus for generating electric waves in a system of wireless telegraphy.

Same as Oscillaria.

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

An autographic record made by an oscillograph.

apparatus for recording or indicating alternating-current wave forms or other electrical oscillations, usually consisting of a galvanometer 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.

An instrument for measuring the angle through which a ship rolls or pitches at sea.

An instrument for showing visually the changes in a varying current; an oscillograph.