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Hypogeous. [Written also hypogæan.]

Formed or crystallized at depths the earth's surface; -- said of granite, gneiss, and other rocks, whose crystallization is believed of have taken place beneath a great thickness of overlying rocks. Opposed to epigene.

wing under ground; remaining under ground; ripening its fruit under ground. [Written also hypogæous.]

The subterraneous portion of a building, as in amphitheaters, for the service of the games; also, subterranean galleries, as the catacombs.

One of the hypoglossal nerves.

Having the maxilla, or lower jaw, longer than the upper, as in the skimmer.

An hypogynous plant.

Inserted below the pistil or pistils; -- said of sepals, petals, and stamens; having the sepals, petals, and stamens inserted below the pistil; -- said of a flower or a plant. Gray.

One of the hypohyal bones or cartilages.

Exhibiting a downward convexity caused by unequal growth. Cf. Epinastic.

Downward convexity, or convexity of the inferior surface.

A salt of hyponitrous acid.

Containing or derived from nitrogen having a lower valence than in nitrous compounds. Hyponitrous acid (Chem.), an unstable nitrogen acid, NOH, whose salts are produced by reduction of the nitrates, although the acid itself is not isolated in the free state except as a solution in water; -- called also nitrosylic acid.…

An appendage or fold on the lower side of the pharynx, in certain insects.

A salt of hypophosphoric acid.

A salt of hypophosphorous acid.

or containing, phosphorus in a lower state of oxidation than in phosphoric compounds; as, hypophosphoric acid. Hypophosphoric acid (Chem.), an acid, P2H4O6, produced by the slow oxidation of moist phosphorus, and isolated only as a solution in water. It is regarded as a condensation product of one molecule of phosphori…

or containing, phosphorus in a lower state of oxidation than in phosphoric compounds; as, hypophosphorous acid. Hypophosphorous acid (Chem.) , an acid, H3PO2, whose salts are produced by the action of barium hygrate on phosphorus. It may be obtained from its water solution, by exaporation and freezing, as a white cryst…

Being or growing on the under side of a leaf, as the fruit dots of ferns.

Of or pertaining to the hypophysis; pituitary.