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The chrysalis, or pupa of an insect, esp. when reflecting a brilliant golden color, as that of some of the butterflies.

. -- Optic axis, Visual axis (Opt.), the straight line passing through the center of the pupil, and perpendicular to the surface of the eye. -- Radical axis of two circles (Geom.), the straight line perpendicular to the line joining their centers and such that the tangents from any point of it to the two circles shal…

tending to seat, and that tending to unseat the valve, are nearly in equilibrium; esp., a puppet valve which is made to operate easily by the admission of steam to both sides. See Puppet valve. -- Hydrostatic balance. See under Hydrostatic. -- To lay in balance, to put up as a pledge or security. [Obs.] Chaucer. --…

l of the eye, the eye itself, as distinguished from its lids and socket; -- formerly, the pupil of the eye. -- Ball valve (Mach.), a contrivance by which a ball, placed in a circular cup with a hole in its bottom, operates as a valve. -- Ball vein (Mining), a sort of iron ore, found in loose masses of a globular form…

a bag or basket-like case of silk and twigs, which it afterwards hangs up to shelter the pupa and wingless adult females.

l, or in repelling an attempt to board it. Totten. -- Boarding school, a school in which pupils receive board and lodging as well as instruction.

With a sudden leap; suddenly. This impudent puppy comes bounce in upon me. Bickerstaff.

A young man in training for military or naval service; esp. a pupil in a military or naval school, as at West Point, Annapolis, or Woolwich.

tive of tropical Africa. It is highly poisonous. It is used to produce contraction of the pupil of the eye; also in tetanus, neuralgia, and rheumatic diseases; -- called also ordeal bean, being used by the negroes in trials for witchcraft.

n, penance, etc. -- Canonical sins (Anc. Church.), those for which capital punishment or puplic penance decreed by the canon was inflicted, as idolatry, murder, adultery, heresy.

An instrument to guid the hands and fingers of pupils in playing on the piano, etc.

The pupa state of certain insects, esp. of butterflies, from which the perfect insect emerges. See Pupa, and Aurelia (a).

or surgery is taught by the examination and treatment of patients in the presence of the pupils.

to insects having the abdomen separated from the thorax only by a constriction. Coarctate pupa (Zoöl.), a pupa closely covered by the old larval skin, as in most Diptera.

The case constructed by any insect to contain its larva or pupa.

tening, or shrinking; the state of being contracted; as, contraction of the heart, of the pupil of the eye, or of a tendion; the contraction produced by cold.

nverging; tendency to one point. The convergence or divergence of the rays falling on the pupil. Berkeley.

A plastic operation on the pupil, as for forming an artificial pupil. -- Cor`e*plas"tic (-plas"tik), a.

The transparent part of the coat of the eyeball which covers the iris and pupil and admits light to the interior. See Eye.

h an extensive course of memorizing or study, as in preparation for an examination; as, a pupil is crammed by his tutor.