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The most elevated part of a bivalve shell, or the part in which the hinge is situated. Summit level, the highest level of a canal, a railroad, or the like, in surmounting an ascent.

n swing a pulley of 12 inches diameter. To swing a door, gate, etc. (Carp.), to put it on hinges so that it can swing or turn.

A division of brachiopods including those which have a calcareous shell furnished with a hinge and hinge teeth. Terebratula and Spirifer are examples.

large spiders which make a nest consisting of a vertical hole in the earth, lined with a hinged lid, like a trapdoor. Most of the species belong to the genus Cteniza, as the California species (C. Californica).

n its axis; a spindle turns on a pivot; a man turns on his heel. The gate . . . on golden hinges turning. Milton.

An instrument with a hinged claw, -- used for extracting teeth with a twist.

One of the lateral prominence just above the hinge of a bivalve shell.

or other elastic material, inserted, or fastened to, a rod or stick by means of pivots or hinges, in such a way as to allow of being opened and closed with ease. See Parasol. Underneath the umbrella's oily shed. Gay.

gular and supported on legs or an ornamental framework and the front opening downwards on hinges to serve as a writing desk.

An axis; hinge; a turning point. E. Waterhouse.

of various species of marine bivalve shells belonging to the genus Avicula, in which the hinge border projects like a wing.