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he strength or intensity of an electrical current is directly proportional to the electro-motive force, and inversely proportional to the resistance of the circuit.

, 2. -- Old Nick, Old Scratch, the devil. -- Old lady (Zoöl.), a large European noctuid moth (Mormo maura). -- Old maid. (a) A woman, somewhat advanced in years, who has never been married; a spinster. (b) (Bot.) A West Indian name for the pink- flowered periwinkle (Vinca rosea). (c) A simple game of cards, played b…

Divination by means of a child's navel, to learn how many children the mother may have. Crabb.

The general signification of on is situation, motion, or condition with respect to contact or support beneath; as: --

Hence, figuratively: Alone, by reason of superiority; preëminent; chief. "Motley's the only wear." Shak.

ctively termed oöphytes or Oöphyta), which have their sexual reproduction accomplished by motile antherozoids acting on oöspheres, either while included in their oögonia or after exclusion.

d 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.

exerting force, physical or moral; active in the production of effects; as, an operative motive. It holds in all operative principles. South.

uralite; -- first found in the Pyreness. So called from the colored spots which give it a mottled appearance. -- O*phi"ic, a.

A genus of bombycid moths whose caterpillars (esp. those of Orgyia leucostigma) are often very injurious to fruit trees and shade trees. The female is wingless. Called also vaporer moth.

A child bereaved of both father and mother; sometimes, also, a child who has but one parent living. Orphans' court (Law), a court in some of the States of the Union, having jurisdiction over the estates and persons of orphans or other wards. Bouvier.

h illustrates, by the revolution of balls moved by wheelwork, the relative size, periodic motions, positions, orbits, etc., of bodies in the solar system.

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

ilamentous, fresh- water algæ, the threads of which have an automatic swaying or crawling motion. Called also Oscillatoria.

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

rofessed; apparent; -- often used as opposed to real or actual; as, an ostensible reason, motive, or aim. D. Ramsay.

The larva of the ghost moth. It is very injurious to hop vines. Otter hound, Otter dog (Zoöl.), a small breed of hounds, used in England for hunting otters. -- Otter sheep. See Ancon sheep, under Ancon. -- Otter shell (Zoöl.), very large bivalve mollusk (Schizothærus Nuttallii) found on the northwest coast of America…

to another regarded as on the opposite side of a space or barrier; -- used with verbs of motion; as, to sail over to England; to hand over the money; to go over to the enemy. "We will pass over to Gibeah." Judges xix. 12. Also, with verbs of being: At, or on, the opposite side; as, the boat is over.…

To come up with in a course, pursuit, progress, or motion; to catch up with. Follow after the men; and when thou dost overtake them, say . . . Wherefore have ye rewarded evil for good. Gen. xliv. 4. He had him overtaken in his flight. Spenser.

keys of the genus Nyctipithecus. They have very large eyes. Called also durukuli. -- Owl moth ( (Zoöl.), a very large moth (Erebus strix). The expanse of its wings is over ten inches. -- Owl parrot (Zoöl.), the kakapo. -- Sea owl (Zoöl.), the lumpfish. -- Owl train, a cant name for certain railway trains whose run…