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.

(||Hy`po*phar"ynx) n. [NL. See Hypo-, and Pharynx.] (Zoöl.) An appendage or fold on the lower side of the pharynx, in certain insects.

(Hy`po*phos"phate) n. (Chem.) A salt of hypophosphoric acid.

(Hy`po*phos"phite) n. (Chem.) A salt of hypophosphorous acid.

(Hy`po*phos*phor"ic) a. [Pref. hypo- + phosphoric.] (Chem.) Pertaining to, or derived from, 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 phosphoric acid with one of phosphorous acid, by partial dehydration.

(Hy`po*phos"phor*ous) a. [Pref. hypo- + phosphorous.] (Chem.) Pertaining to, 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 crystalline substance. It is a powerful reducing agent.

(Hy*poph"yl*lous) a. [Pref. hypo- + Gr. leaf.] (Bot.) Being or growing on the under side of a leaf, as the fruit dots of ferns.

(Hy`po*phys"i*al) a. (Anat.) Of or pertaining to the hypophysis; pituitary.

(||Hy*poph"y*sis) n. [NL., fr. Gr. under + nature, origin.]

1. (Anat.) See Pituitary body, under Pituitary.

2. (Med.) Cataract.

(Hy`po*plas"tron) n.; pl. Hypoplastra [Pref. hypo- + plastron.] (Anat.) The third lateral plate in the plastron of turtles; — called also hyposternum.

(||Hy*pop"ti*lum) n.; pl. L. Hypoptila E. Hypoptilums [NL., fr. Gr. "ypo` beneath + down.] (Zoöl.) An accessory plume arising from the posterior side of the stem of the contour feathers of many birds; — called also aftershaft. See Illust. of Feather.

(||Hy`po*ra"di*us) n.; pl. Hyporadii [Pref. hypo- + radius.] (Zoöl.) One of the barbs of the hypoptilum, or aftershaft of a feather. See Feather.

(||Hy`po*rha"chis) n.; pl. Hyporhachides [NL., fr. Gr. "ypo` beneath + spine.] (Zoöl.) The stem of an aftershaft or hypoptilum. [Written also hyporachis.]

(Hy`po*skel"e*tal) a. [Pref. hypo- + skeletal.] (Anat.) Beneath the endoskeleton; hypaxial; as, the hyposkeletal muscles; — opposed to episkeletal.

Hyponitrous to Hysterics

(Hy`po*ni"trous) a. [Pref. hypo- + nitrous.] (Chem.) Containing or derived from nitrogen having a lower valence than in nitrous compounds.

  By PanEris using Melati.

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