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hypodermic syringe a piston syringe fitted to a hollow needle, used to inject a substance under the skin.
hypodermis in plants, a layer of cells directly beneath the epidermis. [2 definitions]
hypoglycemia abnormally low blood glucose concentration.
hypogynous of petals, sepals, and stamens, attached to the receptacle below the pistil, as in a tulip. (Cf. epigynous, perigynous.)
hypolimnion the layer of the water of a lake, below the thermocline, that is coldest and contains the least oxygen. (Cf. epilimnion.)
hypophosphate a salt or neutral ester of hypophosphoric acid.
hypophosphite a salt of hypophosphorous acid.
hypophosphoric acid an acid that results from exposing phosphorous to moist air.
hypophosphorous acid a strong crystalline acid, colorless or slightly yellow, used as a reducing agent.
hypophysis see pituitary gland.
hypoplasia the state or condition of being underdeveloped or undersized, as in a bodily structure or organ.
hypostasis in philosophy, the essence or essential attribute or principle of something. [4 definitions]
hypostatize to present or consider (an idea, concept, or the like) as having concrete, objective reality or form.
hyposulfite a salt of hyposulfurous acid, used in photography.
hyposulfurous acid an unstable acid found only in solution or in the form of its salts, used as a bleaching and reducing agent.
hypotension excessively low blood pressure, or an illness resulting from this condition.
hypotenuse in a right triangle, the side opposite the right angle.
hypothalamus the part of the brain below the thalamus in the ventral region of the diencephalon, important in the regulation of the autonomic nervous system and body temperature.
hypothecate to pledge (property) to another as security for a loan or other debt, without legally transferring title or ownership.
hypothermia a condition of abnormally low body temperature.
hypothesis a proposed explanation that accounts for observed phenomena or known facts and that can be used to guide further investigation. [3 definitions]