Feather-moss, a genus of plants of the natural order musci, belonging to the cryptogamia clas. See Botany Index.

YPHO, a Greek particle, retained in the composition of divers words borrowed from that language; literally denoting under, beneath—In which sense it stands opposed to ὑπερ, ὑψις, "above."

YPHOBOLE, or SUBJECTION, (from ὑπο, and βάλλω, I cast), in Rhetoric, a figure, so called, when several things are mentioned, that seem to make for the contrary side, and each of them refuted in order. This figure, when complete, consists of three parts; a proposition, an enumeration of particulars with their answer, and a conclusion. Thus Cicero, upon his return from banishment, vindicates his conduct in withdrawing so quietly, and not opposing the faction that ejected him. See Oratory, No 81.

YPHOCATHARIS (compounded of ὑπο, under, and καθαρός, I purge), in Medicine, a too faint or feeble purgation.

YPHOCOUSTUM, among the Greeks and Romans, a subterraneous place, where was a furnace to heat the baths. The word is Greek, formed of the preposition ὑπο, under; and the verb καύω, to burn.—Another sort of hypocaustum was a kind of kiln to heat their winter parlours. The remains of a Roman hypocaustum, or sweating-room, were discovered underground 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.

YPPOCHÆRIS, Hawk's-eye, a genus of plants belonging to the syngenesia clas, and in the natural method ranking under the 49th order, Compositæ. See Botany Index.

YPPOCHONDRIA, in Anatomy, a space on each side the epigastric region, or upper part of the abdomen. See Anatomy, No 88.

YPPOCHONDRIAC PASSION, a disease in men, similar to the hysterical affection in women. See Medicine Index.

YPPOCISTIS, in the Materia Medica, an infusorial juice obtained from the febrile affusion, much resembling the true Egyptian acacia. They gather the fruit while unripe, and express the juice, which they evaporate over a very gentle fire, to the consistence of an extract, and then form into cakes, and expose them to the sun to dry. It is an astringent of considerable power; is good against diarrhoeas and haemorrhages of all kinds; and may be used in repellent gargarilms in the manner of the true acacia; but it is very rarely met with genuine in our shops, the German acacia being usually sold under its name.

YPPOCRISY, ἐξοχία, in Ethics, denotes dissimulation with regard to the moral or religious character. In other words, it signifies one who feigns to be what he is not; and is generally applied to those who assume the appearances of virtue or religion, without having anything in reality of either.

YPPOGÆUM, ἐγκέφαλον, formed of ὑπο, under, and γῆ, earth, in the ancient architecture, is a name common to all the parts of a building that are underground; as the cellar, butteries, and the like places. The term hypogæum was used by the Greeks and Romans for subterraneous tombs in which they buried their dead.

YPPOGEUM, ἐγκέφαλον, in Astrology, is a name given to the celestial houses which are below the horizon; and especially the imum coeli, or bottom of heaven.

YPPOGASTRIC, an appellation given to the internal branch of the iliac artery.

YPPOGASTRIUM, in Anatomy, the middle part of