among the Greeks and Romans, a subterraneous place, where was a furnace to heat the baths. The word is Greek, formed of the preposition ὑπὸ under; and the verb καίνω, to burn.—Another fort of hypocaustum was a kind of kiln to heat their winter parlours. The remains of a Roman hypocaustum, or heating-room, were discovered under ground at Lincoln in 1739. We have an account of these remains in the Philosophical Transactions, No. 461, § 29.—Among the moderns, the hypocaustum is that place where the fire is kept which warms a stove or hot-house.

HYPOCHÆRIS, hawk's-eye, a genus of plants belonging to the lyngenea class, and in the natural method ranking under the 49th order, Compositae. See Botany Index.