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able; as, insurmountable difficulty or obstacle. Locke. Hope thinks nothing difficult; despair tells us that difficulty is insurmountable. I. Watts.

Unimpaired, unadulterated, or genuine state; entire correspondence with an original condition; purity. Language continued long in its purity and integrity. Sir M. Hale.

The middle pair of tail feathers, or middle rectrices.

Situated between the petiole and the stem; -- said of the pair of stipules at the base of a petiole when united by those margins next the petiole, thus seeming to form a single stipule between the petiole and the stem or branch; -- often confounded with interpetiolar, from which it differs essentially in meaning.…

. Milton. Shady groves, that easy sleep invite. Dryden. There no delusive hope invites despair. Cowper.

A worker in iron; one who makes and repairs utensils of iron; a blacksmith.

Not reparable; not capable of being repaired, recovered, regained, or remedied; irretrievable; irremediable; as, an irreparable breach; an irreparable loss. Shak.

g out of equal quantities of heat by a substance. Rankine. Isodiabatic lines or curves, a pair of lines or curves exhibiting, on a diagram of energy, the law of variation of the pressure and density of a fluid, the one during the lowering, and the other during the raising, of its temperature, when the quantity of heat…

An order of sessile-eyed Crustacea, usually having seven pairs of legs, which are all similar in structure.

is long and round, consisting of numerous smooth, equal segments, each of which bears two pairs of short legs. It includes the galleyworms. See Chilognatha.

One of a pair of opposing parts which are movable towards or from each other, for grasping or crushing anything between them, as, the jaws of a vise, or the jaws of a stone-crushing machine.

A pair of the opposite leaflets of a pinnate plant.

Twin; paired; -- said of various objects made or formed in pairs, as a binocular opera glass, a pair of gimmal rings, etc.

To last; to endure; to remain unimpaired. If the malt be not thoroughly dried, the ale it makes will not keep. Mortimer.

r (Leptosomus discolor), the only living type of a family allied to the rollers. It has a pair of loral plumes. The male is glossy green above, with metallic reflections; the female is spotted with brown and black.

A tricky, deceitful fellow; a dishonest person; a rogue; a villain. "A pair of crafty knaves." Shak. In defiance of demonstration, knaves will continue to proselyte fools. Ames.

To weaken or impair. [R.]

cts which covers the mouth beneath, and serves as an under lip. It consists of the second pair of maxillæ, usually closely united in the middle line, 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).

acea, in which the abdomen is small or rudimentary and the legs are often reduced to five pairs. The whale louse, or Cyamus, and Caprella are examples.

To endure use, or continue in existence, without impairment or exhaustion; as, this cloth lasts better than that; the fuel will last through the winter.