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Pertaining to the Sipunculoidea. -- n.

In a restricted sense, same as Sipunculacea.

Destitute of a siphon or breathing tube; -- said of many bivalve shells. -- n.

A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks.

The basal joint of the legs of Crustacea.

the base of the embryonic fins of some fishes. It develops into the metapterygium. -- Ba*sip`ter*yg"i*al (, a.

Applied to a protuberance of the base of the sphenoid bone.

Foolish; silly; trifling. [R.]

Capable of being scattered or dissipated. [R.] The heat of those plants is very dissipable. Bacon.

- used esp. of the dispersion of things that can never again be collected or restored. Dissipated those foggy mists of error. Selden. I soon dissipated his fears. Cook. The extreme tendency of civilization is to dissipate all intellectual energy. Hazlitt.

Squandered; scattered. "Dissipated wealth." Johnson.

The act of dissipating or dispersing; a state of dispersion or separation; dispersion; waste. Without loss or dissipation of the matter. Bacon. The famous dissipation of mankind. Sir M. Hale.

Tending to dissipate. Dissipative system (Mech.), an assumed system of matter and motions in which forces of friction and resistances of other kinds are introduced without regard to the heat or other molecular actions which they generate; -- opposed to conservative system.

The rate at which palpable energy is dissipated away into other forms of energy.

Same as Dorsiferous.

An order of holothurians mostly found in the deep sea. They are remarkable for their bilateral symmetry and curious forms. [Written also Elasmopoda.]

St. Anthony's fire; a febrile disease accompanied with a diffused inflammation of the skin, which, starting usually from a single point, spreads gradually over its surface. It is usually regarded as contagious, and often occurs epidemically.

Resembling erysipelas.

Resembling erysipelas, or partaking of its nature.

Erysipelatous.