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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]
hypothetical based on a premise rather than having substance in reality; supposed. [4 definitions]
hypothyroidism a deficiency in thyroid activity and secretion, resulting, if unchecked, in goiter and loss of vigor in victims and in cretinism in fetuses borne by them.
hyrax any of various small plant-eating mammals of Africa and Asia, similar to rodents, that have short ears and tail and hooflike toenails.
hyssop a woody aromatic plant of the mint family that is native to Asia and bears blue flowers in spikes.
hysterectomy surgical removal of the uterus and sometimes the ovaries.
hysteresis a lag in the effect on matter after a change in forces affecting it, esp. magnetic forces.
hysteria in an individual or group, an uncontrollable outburst of fear or other emotions, producing fits of weeping, laughter, irrational behavior, or the like. [2 definitions]
hysteric (usu. pl.; used with a sing. or pl. verb) an outburst of uncontrollable sobbing or laughter. [4 definitions]
hysterical of, concerning, or caused or characterized by hysteria. [3 definitions]
hysterotomy surgical incision of the uterus, as in a Caesarean section.
Hz abbreviation of "hertz," a unit of frequency equal to one cycle per second.
I1 the one who is speaking or writing and referring to himself or herself.
I2 symbol of the chemical element iodine.