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A fluoride of alumina and soda occurring with the Greenland cryolite in octahedral crystals.

signating, a swelling under the tongue; also, pertaining to the region where the swelling occurs; -- applied especially to branches of the lingual artery and lingual vein.

Not frequent; seldom met with or occurring; unusual; as, a rare event.

an action; that which is offered or accepted as an explanation; the efficient cause of an occurrence or a phenomenon; a motive for an action or a determination; proof, more or less decisive, for an opinion or a conclusion; principle; efficient cause; final cause; ground of argument. I'll give him reasons for it. Shak.…

Of late origin, existence, or occurrence; lately come; not of remote date, antiquated style, or the like; not already known, familiar, worn out, trite, etc.; fresh; novel; new; modern; as, recent news. The ancients were of opinion, that a considerable portion of that country [Egypt] was recent, and formed out of the mu…

To occur at a stated interval, or according to some regular rule; as, the fever will recur to-night.

refraction of a ray of light into an infinite number of rays, forming a hollow cone. This occurs when a ray of light is passed through crystals of some substances, under certain circumstances. Conical refraction is of two kinds; external conical refraction, in which the ray issues from the crystal in the form of a cone…

Governed by rule or rules; steady or uniform in course, practice, or occurence; not subject to unexplained or irrational variation; returning at stated intervals; steadily pursued; orderlly; methodical; as, the regular succession of day and night; regular habits.

sh in writing an account of a speech, the proceedings at a meeting, the particulars of an occurrence, etc., for publication.

The movement of rotetion which usually occurs in childbirth after the head has been delivered, and which causes the latter to point towards the side to which it was directed at the beginning of labor.

principally due to the moon's transit immediatelly proceeding, but to a transit which has occured some time before, and which is said to correspond to it. The retard of the tide is thus distinguished from the lunitidal interval. See under Retardation. rHam. Nav. Encyc.

A loose or irregular train of thought occurring in musing or mediation; deep musing; daydream. "Rapt in nameless reveries." Tennyson. When ideas float in our mind without any reflection or regard of the understanding, it is that which the French call revery, our language has scarce a name for it. Locke.…

Manganese carbonate, a rose-red mineral sometimes occuring crystallized, but generally massive with rhombohedral cleavage like calcite; -- called also dialogite.

Manganese spar, or silicate of manganese, a mineral occuring crystallised and in rose-red masses. It is often used as an ornamental stone.

The glycerin salt of ricinoleic acid, occuring as a characteristic constituent of castor oil; -- formerly called palmin.

mortis ( Etym: [L. , rigor of death] , death stiffening; the rigidity of the muscles that occurs at death and lasts till decomposition sets in. It is due to the formation of myosin by the coagulation of the contents of the individual muscle fibers.

e, and forming ring-shaped discolored patches covered with vesicles or powdery scales. It occurs either on the body, the face, or the scalp. Different varieties are distinguished as Tinea circinata, Tinea tonsurans, etc., but all are caused by the same parasite (a species of Trichophyton).

To come to mind; to be suggested; to occur. A thought rose in me, which often perplexes men of contemplative natures. Spectator.

A kind of alum occuring in small fragments; -- so called from Rocca, in Syria, whence alum is said to have been obtained; -- also called rock alum.

spiny lobster, and sea crayfish. -- Rock meal (Min.), a light powdery variety of calcite occuring as an efflorescence. -- Rock milk. (Min.) See Agaric mineral, under Agaric. -- Rock moss, a kind of lichen; the cudbear. See Cudbear. -- Rock oil. See Petroleum. -- Rock parrakeet (Zoöl.), a small Australian parrakeet…