| hippopotamus | (noun) massive thick-skinned herbivorous animal living in or around rivers of tropical Africa | Synonyms: hippo, Hippopotamus amphibius, river horse |
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| hodgepodge | (noun) a theory or argument made up of miscellaneous or incongruous ideas | Synonyms: jumble, patchwork |
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| (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hotchpotch, melange, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum, ragbag |
| homospory | (noun) the development of a single kind of asexual spores | - |
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| honeypot | (noun) South African shrub whose flowers when open are cup-shaped resembling artichokes | Synonyms: king protea, Protea cynaroides |
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| hoopoe | (noun) any of several crested Old World birds with a slender downward-curved bill | Synonyms: hoopoo |
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| hoopoo | (noun) any of several crested Old World birds with a slender downward-curved bill | Synonyms: hoopoe |
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| hornpout | (noun) catfish common in eastern United States | Synonyms: Ameiurus Melas, horned pout, pout |
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| horsepond | (noun) a pond for watering horses | - |
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| horsepower | (noun) a unit of power equal to 746 watts | Synonyms: H.P., HP |
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| hotchpotch | (noun) a stew (or thick soup) made with meat and vegetables | - |
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| (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hodgepodge, melange, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum, ragbag |
| hotpot | (noun) a stew of meat and potatoes cooked in a tightly covered pot | Synonyms: hot pot |
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| hotspot | (noun) a lively entertainment spot | Synonyms: hot spot |
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| (noun) a point of relatively intense heat or radiation | Synonyms: hot spot |
| (noun) a place of political unrest and potential violence | Synonyms: flashpoint, hot spot, trouble spot |
| hydroponics | (noun) a technique of growing plants (without soil) in water containing dissolved nutrients | Synonyms: aquiculture, tank farming |
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| hyperbetalipoproteinemia | (noun) a genetic disorder characterized by high levels of beta-lipoproteins and cholesterol; can lead to atherosclerosis at an early age | - |
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| hyperlipoidaemia | (noun) presence of excess lipids in the blood | Synonyms: hyperlipaemia, hyperlipemia, hyperlipidaemia, hyperlipidemia, hyperlipoidemia, lipaemia, lipemia, lipidaemia, lipidemia, lipoidaemia, lipoidemia |
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| hyperlipoidemia | (noun) presence of excess lipids in the blood | Synonyms: hyperlipaemia, hyperlipemia, hyperlipidaemia, hyperlipidemia, hyperlipoidaemia, lipaemia, lipemia, lipidaemia, lipidemia, lipoidaemia, lipoidemia |
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| hyperlipoproteinemia | (noun) any of various disorders of lipoprotein and cholesterol metabolism that result in high levels of lipoprotein and cholesterol in the circulating blood | - |
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| hypo | (noun) a piston syringe that is fitted with a hypodermic needle for giving injections | Synonyms: hypodermic, hypodermic syringe |
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| (noun) a compound used as a fixing agent in photographic developing | Synonyms: sodium thiosulfate, sodium thiosulphate |
| hypoadrenalism | (noun) a glandular disorder caused by failure of function of the cortex of the adrenal gland and marked by anemia and prostration with brownish skin | Synonyms: Addison's disease, Addison's syndrome, hypoadrenocorticism |
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| hypoadrenocorticism | (noun) a glandular disorder caused by failure of function of the cortex of the adrenal gland and marked by anemia and prostration with brownish skin | Synonyms: Addison's disease, Addison's syndrome, hypoadrenalism |
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| hypobasidium | (noun) special cell constituting the base of the basidium in various fungi especially of the order Tremellales | - |
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| hypobetalipoproteinemia | (noun) a hereditary disorder characterized by low levels of beta-lipoproteins and lipids and cholesterol | - |
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| hypoblast | (noun) the inner germ layer that develops into the lining of the digestive and respiratory systems | Synonyms: endoblast, endoderm, entoblast, entoderm |
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| hypocalcaemia | (noun) abnormally low level of calcium in the blood; associated with hypoparathyroidism or kidney malfunction or vitamin D deficiency | Synonyms: hypocalcemia |
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| hypocalcemia | (noun) abnormally low level of calcium in the blood; associated with hypoparathyroidism or kidney malfunction or vitamin D deficiency | Synonyms: hypocalcaemia |
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| hypocapnia | (noun) a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing | Synonyms: acapnia |
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| hypocellularity | (noun) the state of having abnormally few cells | - |
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| hypochlorite | (noun) any salt or ester of hypochlorous acid | - |
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| hypochondria | (noun) chronic and abnormal anxiety about imaginary symptoms and ailments | Synonyms: hypochondriasis |
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| hypochondriac | (noun) a patient with imaginary symptoms and ailments | - |
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| hypochondriasis | (noun) chronic and abnormal anxiety about imaginary symptoms and ailments | Synonyms: hypochondria |
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| hypochondrium | (noun) the upper region of the abdomen just below the lowest ribs on either side of the epigastrium | - |
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| hypocorism | (noun) a name of endearment (especially one using a diminutive suffix) | Synonyms: pet name |
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| hypocrisy | (noun) insincerity by virtue of pretending to have qualities or beliefs that you do not really have | - |
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| (noun) an expression of agreement that is not supported by real conviction | Synonyms: lip service |
| hypocrite | (noun) a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives | Synonyms: dissembler, dissimulator, phoney, phony, pretender |
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| hypocycloid | (noun) a line generated by a point on a circle that rolls around inside another circle | - |
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| hypodermic | (noun) a piston syringe that is fitted with a hypodermic needle for giving injections | Synonyms: hypo, hypodermic syringe |
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| hypodermis | (noun) layer of cells that secretes the chitinous cuticle in e.g. arthropods | - |
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| hypoesthesia | (noun) impairment of tactile sensitivity; decrease of sensitivity | Synonyms: hypesthesia |
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| hypogammaglobulinemia | (noun) an abnormally low concentration of gamma globulin in the blood and increased risk of infection | - |
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| hypoglossal | (noun) supplies intrinsic muscles of the tongue and other tongue muscles | Synonyms: hypoglossal nerve, nervus hypoglosus, twelfth cranial nerve |
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| hypoglycaemia | (noun) abnormally low blood sugar usually resulting from excessive insulin or a poor diet | Synonyms: hypoglycemia |
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| hypoglycemia | (noun) abnormally low blood sugar usually resulting from excessive insulin or a poor diet | Synonyms: hypoglycaemia |
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| hypogonadism | (noun) incompetence of the gonads (especially in the male with low testosterone); results in deficient development of secondary sex characteristics and (in prepubertal males) a body with long legs and a short trunk | - |
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| hypokalemia | (noun) abnormally low level of potassium in the circulating blood leading to weakness and heart abnormalities; associated with adrenal tumors or starvation or taking diuretics | - |
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| hypolipoproteinemia | (noun) any of various disorders of lipoprotein and cholesterol metabolism that result in low levels of lipoprotein and cholesterol in the circulating blood | - |
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| hyponatremia | (noun) abnormally low level of sodium in the blood; associated with dehydration | - |
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| hyponym | (noun) a word that is more specific than a given word | Synonyms: subordinate, subordinate word |
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| hyponymy | (noun) the semantic relation of being subordinate or belonging to a lower rank or class | Synonyms: subordination |
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| hypoparathyroidism | (noun) inadequate secretion of parathyroid hormone resulting in abnormally low levels of calcium in the blood | - |
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| hypophysectomy | (noun) surgical removal of the pituitary gland | - |
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| hypophysis | (noun) the master gland of the endocrine system; located at the base of the brain | Synonyms: pituitary, pituitary body, pituitary gland |
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| hypopigmentation | (noun) unusual lack of skin color | - |
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| hypoplasia | (noun) underdevelopment of an organ because of a decrease in the number of cells | - |
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| hypopnea | (noun) slow or shallow breathing | - |
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| hypoproteinemia | (noun) abnormally low level of protein in the blood; can indicate inadequate diet or intestinal or renal disorders | - |
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| hyposmia | (noun) lessened sensitivity to odors | - |
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| hypospadias | (noun) an abnormal condition in males in which the urethra opens on the under surface of the penis | - |
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| hypostasis | (noun) (metaphysics) essential nature or underlying reality | - |
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| (noun) any of the three persons of the Godhead constituting the Trinity especially the person of Christ in which divine and human natures are united | Synonyms: hypostasis of Christ |
| (noun) the accumulation of blood in an organ | - |
| (noun) the suppression of a gene by the effect of an unrelated gene | Synonyms: epistasis |
| hypostatisation | (noun) regarding something abstract as a material thing | Synonyms: hypostatization, reification |
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| hypostatization | (noun) regarding something abstract as a material thing | Synonyms: hypostatisation, reification |
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| hypotension | (noun) abnormally low blood pressure | - |
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| hypotensive | (noun) a person who has abnormally low blood pressure | - |
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| hypotenuse | (noun) the side of a right triangle opposite the right angle | - |
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| hypothalamus | (noun) a basal part of the diencephalon governing autonomic nervous system | - |
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| hypothermia | (noun) subnormal body temperature | - |
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| hypothesis | (noun) a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena | Synonyms: possibility, theory |
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| (noun) a proposal intended to explain certain facts or observations | - |
| (noun) a message expressing an opinion based on incomplete evidence | Synonyms: conjecture, guess, speculation, supposition, surmisal, surmise |
| hypothetical | (noun) a hypothetical possibility, circumstance, statement, proposal, situation, etc. | - |
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| hypothrombinemia | (noun) a low level of prothrombin (factor II) in the circulating blood; results in long clotting time and poor clot formation and sometimes excessive bleeding; can result from vitamin K deficiency | - |
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| hypothyroidism | (noun) an underactive thyroid gland; a glandular disorder resulting from insufficient production of thyroid hormones | - |
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| hypotonia | (noun) (of muscular tissue) the state of being hypotonic | Synonyms: hypotonicity, hypotonus |
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| hypotonicity | (noun) (of muscular tissue) the state of being hypotonic | Synonyms: hypotonia, hypotonus |
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| (noun) (of a solution) the extent to which a solution has a lower osmotic pressure than some other | - |
| hypotonus | (noun) (of muscular tissue) the state of being hypotonic | Synonyms: hypotonia, hypotonicity |
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| hypotyposis | (noun) vivid picturesque description. | - |
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| hypovitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: avitaminosis |
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| hypovolaemia | (noun) a blood disorder consisting of a decrease in the volume of circulating blood | Synonyms: hypovolemia |
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| hypovolemia | (noun) a blood disorder consisting of a decrease in the volume of circulating blood | Synonyms: hypovolaemia |
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| hypoxia | (noun) oxygen deficiency causing a very strong drive to correct the deficiency | - |
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| hypozeugma | (noun) use of a series of subjects with a single predicate | - |
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| hypozeuxis | (noun) use of a series of parallel clauses (as in `I came, I saw, I conquered') | - |
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| impoliteness | (noun) a discourteous manner that ignores accepted social usage | - |
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| imponderable | (noun) a factor whose effects cannot be accurately assessed | - |
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| import | (noun) commodities (goods or services) bought from a foreign country | Synonyms: importation |
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| (noun) having important effects or influence | Synonyms: consequence, moment |
| (noun) a meaning that is not expressly stated but can be inferred | Synonyms: implication, significance |
| (noun) the message that is intended or expressed or signified | Synonyms: meaning, significance, signification |
| (noun) an imported person brought from a foreign country | Synonyms: importee |
| importance | (noun) the quality of being important and worthy of note | - |
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| (noun) a prominent status | Synonyms: grandness |
| importation | (noun) the commercial activity of buying and bringing in goods from a foreign country | Synonyms: importing |
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| (noun) commodities (goods or services) bought from a foreign country | Synonyms: import |
| importee | (noun) an imported person brought from a foreign country | Synonyms: import |
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| importer | (noun) someone whose business involves importing goods from outside (especially from a foreign country) | - |
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| importing | (noun) the commercial activity of buying and bringing in goods from a foreign country | Synonyms: importation |
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| importunateness | (noun) Quality of a person who is given to making importunate demands, being greedily or thoughtlessly demanding. | Synonyms: importunity |
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| importunity | (noun) Quality of a person who is given to making importunate demands, being greedily or thoughtlessly demanding. | Synonyms: importunateness |
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| (noun) insistent solicitation and entreaty | Synonyms: urgency, urging |
| imposition | (noun) the act of imposing something (as a tax or an embargo) | Synonyms: infliction |
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| (noun) an uncalled-for burden | - |
| impossibility | (noun) an alternative that is not available | Synonyms: impossible action |
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| (noun) incapability of existing or occurring | Synonyms: impossibleness |
| impossible | (noun) something that cannot be done | - |
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| impossibleness | (noun) incapability of existing or occurring | Synonyms: impossibility |
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| impost | (noun) the lowest stone in an arch -- from which it springs | Synonyms: springer |
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| (noun) money collected under a tariff | Synonyms: custom, customs, customs duty |
| imposter | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, impostor, pretender, pseud, pseudo, role player, sham, shammer |
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| impostor | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, pretender, pseud, pseudo, role player, sham, shammer |
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| imposture | (noun) pretending to be another person | Synonyms: impersonation |
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| impotence | (noun) the quality of lacking strength or power; being weak and feeble | Synonyms: impotency, powerlessness |
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| (noun) an inability (usually of the male animal) to copulate | Synonyms: impotency |
| impotency | (noun) the quality of lacking strength or power; being weak and feeble | Synonyms: impotence, powerlessness |
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| (noun) an inability (usually of the male animal) to copulate | Synonyms: impotence |