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An adjustable diaphragm, suggesting the iris of the eye in its action, for regulating the aperture of a lens, consisting of a number of thin pieces fastened to a ring. It is used in cameras and microscopes.

The third person singular of the substantive verb be, in the indicative mood, present tense; as, he is; he is a man. See Be.

Uniform in time; of equal time; performed in equal times; recurring at regular intervals; isochronal vibrations or oscillations.

which the three axes are of equal length and at right angles to each other; monometric; regular; cubic. Cf. Crystallization. Isometric lines (Thermodynamics), lines representing in a diagram the relations of pressure and temperature in a gas, when the volume remains constant. -- Isometrical perspective. See under Pers…

exas and Mexico to Patagonia. It is usually brownish yellow, with large, dark, somewhat angular rings, each generally inclosing one or two dark spots. It is chiefly arboreal in its habits. Called also the American tiger.

A regular vibration, as of a pendulum. I love thee not a jar of the clock. Shak.

] was the first year of the 299th lunar cycle. The common year is said to be defective, regular, or perfect (or abundant) according as it has 353, 354, or 355 days. The leap year has an intercalary month, and a total of 383 (defective), 384 (regular), or 385 (perfect, or abundant) days. The calendar is complicated by v…

A triangular sail set upon a stay or halyard extending from the foremast or fore-topmast to the bowsprit or the jib boom. Large vessels often carry several jibe; as, inner jib; outer jib; flying jib; etc.

the action of the cutter is guided or limited; -- used for forming the profile of an irregularly shaped piece; a profiling machine.

A rub; a slight stop; an obstruction; hence, an irregularity in motion of from; a hitch; a break in the direction of a line or the surface of a plane. Glanvill. Jog trot, a slow, regular, jolting gait; hence, a routine habit or method, persistently adhered to. T. Hook.

to the truth of things, to reason, or to a proper standard; exact; normal; reasonable; regular; due; as, a just statement; a just inference. Just of thy word, in every thought sincere. Pope. The prince is here at hand: pleaseth your lordship To meet his grace just distance 'tween our armies. Shak. He was a comely pers…

A singular, crested, grallatorial bird (Rhinochetos jubatus), native of New Caledonia. It is gray above, paler beneath, and the feathers of the wings and tail are handsomely barred with brown, black, and gray. It is allied to the sun bittern.

A singular nocturnal parrot (Strigops habroptilus), native of New Zealand. It lives in holes during the day, but is active at night. It resembles an owl in its colors and general appearance. It has large wings, but can fly only a short distance. Called also owl parrot, night parrot, and night kaka.

Applied to a variety of tumor forming hard, flat, irregular excrescences upon the skin. -- n.

Regular order or proper condition. [Written also kilter.] [Colloq.] If the organs of prayer be out of kelter or out of tune, how can we pray Barrow.

A family of tones whose regular members are called diatonic tones, and named key tone (or tonic) or one (or eight), mediant or three, dominant or five, subdominant or four, submediant or six, supertonic or two, and subtonic or seven. Chromatic tones are temporary members of a key, under such names as " sharp four," "fl…

See Kickshaws, the correct singular.

Irregular; stubborn in particulars. [Obs.] The informers continued in a knobby kind of obstinacy. Howell.

the Prussian Diet in May, 1873, of the so-called May laws, or Falk laws, aiming at the regulation of the clergy. Opposition eventually compelled the government to change its policy, and from 1880 to 1887 laws virtually nullifying the May laws were enacted.

but bearing a pair of palpi in most insects. It often consists of a thin anterior part (ligula or palpiger) and a firmer posterior plate (mentum).