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An officer in the Spartan army commanding fifty men. Mitford.

A troop of fifty soldiers in the Spartan army; -- called also pentecostys. Jowett (Thucyd. ).

Situated around bone; of or pertaining to the periosteum.

The membrane of fibrous connective tissue which closely invests all bones except at the articular surfaces.

Inflammation of the periosteum.

A chitinous membrane covering the exterior of many shells; -- called also epidermis.

An order of Echini, including the irregular sea urchins, as the spatangoids. See Spatangoid.

A solid unctuous material, of which candles are made.

Natural affection, as of parents for their children. [R.]

Any bat of the genus Phyllostoma, or allied genera, having large membranes around the mouth and nose; a nose-leaf bat.

A phyllostome.

An alkaloid found in the Calabar bean (the seed of Physostigma venenosum), and extracted as a white, tasteless, substance, amorphous or crystalline; -- formerly called eserine, with which it was regarded as identical.

An order of fishes in which the air bladder is provided with a duct, and the ventral fins, when present, are abdominal. It includes the salmons, herrings, carps, catfishes, and others.

Pertaining to the Physostomi.

Same as Plagiostomous.

One of the Plagiostomi.

An order of fishes including the sharks and rays; -- called also Plagiostomata.

Of or pertaining to the Plagiostomi.

The antero-lateral piece which articulates the sternum of birds.

An order of Bryozoa of which Rhabdopleura is the type. See Rhabdopleura.