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observed in some volcanic rocks, as in rhyolitic lavas. It is supposed to be produced by expanding gas, whence the name.

ty measured. Dry meter, a gas meter having measuring chambers, with flexible walls, which expand and contract like bellows and measure the gas by filling and emptying. -- W, a gas meter in which the revolution of a chambered drum in water measures the gas passing through it.

lugged with a piece of iron, which, by the explosion of the charge, is driven farther in, expanding the sides to fit closely the grooves of the barrel.

fungus (Agaricus campestris), having a white stalk which bears a convex or oven flattish expanded portion called the pileus. This is whitish and silky or somewhat scaly above, and bears on the under side radiating gills which are at first flesh-colored, but gradually become brown. The plant grows in rich pastures and…

Not drawn together, closed, or contracted; extended; expanded; as, an open hand; open arms; an open flower; an open prospect. Each, with open arms, embraced her chosen knight. Dryden.

To spread out; to expand; -- usually as a past part. or adj.

A framework of steel or whalebone, worn by women to expand their dresses; a kind of bustle.

A parenthetical notice, usually of matter to be afterward expanded. Smart.

Open; expanded; evident; apparent; unconcealed; manifest; public; conspicuous. He had received instructions, both patent and secret. Motley.

Open; expanded; slightly spreading; having the parts loose or dispersed; as, a patulous calyx; a patulous cluster of flowers. The eyes are large and patulous. Sir J. Hill.

dir Shah, held by the shahs of Persia (later Iran); -- so called from its bearing a fully expanded peacock's tail done in gems.

yx of a crinoid. Pelvis of the kidney (Anat.), the basinlike cavity into which the ureter expands as it joins the kidney.

One of the expanded ambulacra which form a rosette on the black of certain Echini.

The expanded upper portion of many of the fungi. See Mushroom.

To make rare, thin, porous, or less dense; to expand or enlarge without adding any new portion of matter to; -- opposed to condense.

shining; glittering; glistening; bright; luminous; splendid. Gorgeous banners to the sun expand Their streaming volumes of relucent gold. Glover.

owerless plants which, when dry, close up so as to resemble a bird's nest, but revive and expand again when moistened. The name is sometimes also given to the rose of Jericho. See under Rose.

Full and smoothly expanded; not defective or abrupt; finished; polished; -- said of style, or of authors with reference to their style. [Obs.] In his satires Horace is quick, round, and pleasant. Peacham.

vulgaris) inhabiting the islands of the Indian ocean. It measures about a yard across the expanded wings.

a Fabricii) having a bright orange convex body covered with finely granulated scales. Its expanded tentacles are bright red.