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on a bolt, or screw, for tightening or holding something, or for transmitting motion. See Illust. of lst Bolt.

ecial "sleeping" positions or make curvatures under the influence of darkness. It is well illustrated in the leaflets of clover and other leguminous plants.

Totipalmate; -- said of the feet of certain birds. See Illust. of Aves. Oared shrew (Zoöl.), an aquatic European shrew (Crossopus ciliatus); -- called also black water shrew.

an image of the object, which is then viewed by the eyepiece. Called also objective. See Illust. of Microscope. -- Object lesson, a lesson in which object teaching is made use of. -- Object staff. (Leveling) Same as Leveling staff. -- Object teaching, a method of instruction, in which illustrative objects are emplo…

Inauspicious; ill-omened. [R.] [A Latinism] At the cheerful light, The groaning ghosts and birds obscene take flight. Dryden.

Covered over, shaded, or darkened; destitute of light; imperfectly illuminated; dusky; dim. His lamp shall be put out in obscure darkness. Prov. xx. 20.

To occasion. [Obs.] The lowest may occasionate much ill. Dr. H. More.

arade for field exercises. Farrow. -- To be well off, to be in good condition. -- To be ill off, To be badly off, to be in poor condition.

A short prostrate shoot, which takes root and produces a tuft of leaves, etc. See Illust. of Houseleek.

ction of which is the form of the letter S, with the convex part above; cyma reversa. See Illust. under Cyma.

position, and they are variously used for food, for solvents, for anointing, lubrication, illumination, etc. By extension, any substance of an oily consistency; as, oil of vitriol.

The third division of the stomach of ruminants. See Manyplies, and Illust. under Ruminant.

s or portents; to have omens or premonitions regarding; to predict; to augur; as, to omen ill of an enterprise. The yet unknown verdict, of which, however, all omened the tragical contents. Sir W. Scott.

d of the genus Anastomus, allied to the stork; -- so called because the two parts of the bill touch only at the base and tip. One species inhabits India, another Africa. Called also open- beak. See Illust. (m), under Beak.

The fold of integument, usually supported by bony plates, which protects the gills of most fishes and some amphibians; the gill cover; the gill lid.

The typical genus of ophidioid fishes. [Written also Ophidium.] See Illust. under Ophidioid.

grooved beneath and are often very fragile; -- called also Ophiuroida and Ophiuridea. See Illust. under Brittle star.

optic nerves (the first pair of cranial nerves) which are distributed to the retina. See Illust. of Brain, and Eye.

ra had only three functional toes, and supported the body in walking as in Iguanodon. See Illust. in Appendix.

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