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ed, and no portion of it transmitted. The sine of this angle is the reciprocal of the refractive index of the medium. -- Critical philosophy, the metaphysical system of Kant; -- so called from his most important work, the "Critique of Pure Reason." - - Critical point (Physics), a certain temperature, different for dif…

A small, active, winged species of cockroach (Ectobia Germanica), the water bug. It is common aboard ships, and in houses in cities, esp. in those with hot-water pipes.

andra, syn. Veronica, Virginica) common in most moist woods of North America , used as an active cathartic and emetic; also, the plant itself.

The nucleus of a cell; the germinal or active spot of a cellule, through or in which cell development takes place.

Little and active; spruce; trim; smart; neat in dress or appearance; lively. He wondered how so many provinces could be held in subjection by such a dapper little man. Milton. The dapper ditties that I wont devise. Spenser. Sharp-nosed, dapper steam yachts. Julian Hawthorne.

Still as death; motionless; inactive; useless; as, dead calm; a dead load or weight.

Full of deeds or exploits; active; stirring. [R.] "A deedful life." Tennyson.

Not performing, or not having performed, deeds or exploits; inactive. Deedless in his tongue. Shak.

Industrious; active. [R.] Cowper.

Free; nimble; sprightly; active. [Obs.] Wonderly deliver and great of strength. Chaucer.

Actively; quickly; nimbly. [Obs.] Swim with your bodies, And carry it sweetly and deliverly. Beau. & Fl.

isorganization or disarming of troops which have previously been mobilized or called into active service; the change from a war footing to a peace footing.

Having a passive form with an active meaning, as certain latin and Greek verbs.

The lifeless food matter in the cytoplasm of an ovum or a cell, as distinguished from the active or true protoplasm; yolk substance; yolk.

Ready and expert in the use of the body and limbs; skillful and active with the hands; handy; ready; as, a dexterous hand; a dexterous workman.

A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.

Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive; as, the dioptric system; a dioptric glass or telescope. "Dioptrical principles." Nichol. Dioptric curve (Geom.), a Cartesian oval. See under Cartesian.

Lacking ability; unable. [Obs.] "Our disable and unactive force." Daniel.

Distractive. [Obs.]

Active by day; -- applied especially to the eagles and hawks among raptorial birds, and to butterflies (Diurna) among insects. Diurnal aberration (Anat.), the aberration of light arising from the effect of the earth's rotation upon the apparent direction of motion of light. -- Diurnal arc, the arc described by the sun…