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One of the natural groups, more important than an order, into which some classes are divided; as, the angiospermous subclass of exogens.

A convex lens of glass for producing heat by converging the sun's rays into a focus. "Lighting a cigar with a sunglass." Hawthorne.

from a tangent plane toward the same side, as the surface of a sphere; -- opposed to anticlastic. Sir W. Thomson.

Bad small beer; also, the refuse or dregs of liquor. [Obs. or Prov. Eng.] The taplash of strong ale and wine. Taylor (1630).

Any sea tortoise.

Of or pertaining to the sea; -- sometimes applied to rocks formed from sediments deposited upon the sea bottom.

Any species of Thalaassinidæ, a family of burrowing macrurous Crustacea, having a long and soft abdomen.

The study or science of the life of marine organisms. Agassiz.

A remodeling or reshaping of the thorax; especially, the operation of removing the ribs, so as to obliterate the pleural cavity in cases of empyema.

Three-fold; triple; treble. [Obs.] Cudworth.

condition of the ovum in which there are three primary germinal layers, or in which the blastoderm splits into three layers.

To free from ballast; to discharge ballast from. Totten.

Freed from ballast; having discharged ballast.

To loose the clasp of; to open, as something that is fastened, or as with, a clasp; as, to unclasp a book; to unclasp one's heart.

Not elastic; inelastic.

Inelasticity.

To loose, as that which is lashed or tied down.

The process of forming an artificial palate.

The plastic operation for closing a fissure in the hard palate.

ation for the repair of an injury or a defect in the walls of the urethra. -- U*re`thro*plas"tic, a.