| 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] |
| hypothesize |
to form a hypothesis; make an informed guess; theorize. [2 definitions] |