| headcanon | (noun) A personal version of the fantasy world from popular media | - |
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| heinous | (adjective) extremely wicked, deeply criminal | Synonyms: flagitious |
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| heinously | (adverb) in a terribly evil manner | Synonyms: monstrously |
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| heinousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, atrocity, barbarity, barbarousness |
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| hemianopia | (noun) blindness in one half of the visual field of one or both eyes | Synonyms: hemianopsia |
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| hemianopsia | (noun) blindness in one half of the visual field of one or both eyes | Synonyms: hemianopia |
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| hemoglobinopathy | (noun) a blood disease characterized by the presence of abnormal hemoglobins in the blood | Synonyms: haemoglobinopathy |
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| hepatocarcinoma | (noun) carcinoma of the liver | Synonyms: hepatocellular carcinoma, hepatoma, malignant hepatoma |
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| heterogenous | (adjective) originating outside the body | Synonyms: heterogeneous |
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| (adjective) consisting of elements that are not of the same kind or nature | Synonyms: heterogeneous |
| hobnob | (verb) rub elbows with | - |
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| hominoid | (noun) a primate of the superfamily Hominoidea | - |
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| homogenous | (adjective) all of the same or similar kind or nature | Synonyms: homogeneous |
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| homophonous | (adjective) characteristic of the phenomenon of words of different origins that are pronounced the same way | - |
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| honor | (noun) the quality of being honorable and having a good name | Synonyms: honour |
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| (noun) a woman's virtue or chastity | Synonyms: honour, pureness, purity |
| (noun) a tangible symbol signifying approval or distinction | Synonyms: accolade, award, honour, laurels |
| (noun) the state of being honored | Synonyms: honour, laurels |
| (verb) accept as pay | Synonyms: honour |
| (verb) bestow honor or rewards upon | Synonyms: honour, reward |
| (verb) show respect towards | Synonyms: abide by, honour, observe, respect |
| honorable | (adjective) worthy of being honored; entitled to honor and respect | Synonyms: honourable |
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| (adjective) not disposed to cheat or defraud; not deceptive or fraudulent; marked by truth | Synonyms: honest |
| (adjective) deserving of esteem and respect | Synonyms: admirable, estimable, good, respectable |
| (adjective) adhering to ethical and moral principles | Synonyms: ethical, honourable |
| honorableness | (noun) the quality of deserving honor or respect; characterized by honor | Synonyms: honourableness |
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| honorably | (adverb) with honor | Synonyms: honourably |
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| (adverb) in an honorable manner | Synonyms: uprightly |
| honorarium | (noun) a fee paid for a nominally free service | - |
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| honorary | (adjective) given as an honor without the normal duties | - |
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| honored | (adjective) having an illustrious reputation; respected | Synonyms: esteemed, honoured, prestigious |
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| honoree | (noun) a recipient of honors in recognition of noteworthy accomplishments | - |
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| honorific | (adjective) conferring or showing honor or respect | - |
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| (noun) an expression of respect | - |
| honoring | (noun) conformity with law or custom or practice etc. | Synonyms: honouring, observance |
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| honour | (noun) the quality of being honorable and having a good name | Synonyms: honor |
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| (noun) a woman's virtue or chastity | Synonyms: honor, pureness, purity |
| (noun) a tangible symbol signifying approval or distinction | Synonyms: accolade, award, honor, laurels |
| (noun) the state of being honored | Synonyms: honor, laurels |
| (verb) accept as pay | Synonyms: honor |
| (verb) bestow honor or rewards upon | Synonyms: honor, reward |
| (verb) show respect towards | Synonyms: abide by, honor, observe, respect |
| honourable | (adjective) worthy of being honored; entitled to honor and respect | Synonyms: honorable |
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| (adjective) adhering to ethical and moral principles | Synonyms: ethical, honorable |
| honourableness | (noun) the quality of deserving honor or respect; characterized by honor | Synonyms: honorableness |
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| honourably | (adverb) with honor | Synonyms: honorably |
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| honoured | (adjective) having an illustrious reputation; respected | Synonyms: esteemed, honored, prestigious |
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| honouring | (noun) conformity with law or custom or practice etc. | Synonyms: honoring, observance |
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| honours | (noun) a university degree with honors | Synonyms: honours degree |
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| hooknose | (noun) a nose with a prominent slightly aquiline bridge | Synonyms: Roman nose |
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| humanoid | (noun) an automaton that resembles a human being | Synonyms: android, mechanical man |
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| hymenopter | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopteran, hymenopteron, hymenopterous insect |
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| hymenopteran | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopter, hymenopteron, hymenopterous insect |
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| hymenopteron | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopter, hymenopteran, hymenopterous insect |
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| hymenopterous | (adjective) of or relating to insects of the order Hymenoptera | - |
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| hymnody | (noun) the act of singing psalms or hymns | Synonyms: psalmody |
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| hymnography | (noun) (music) the craft of hymn composition. | - |
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| hyperadrenocorticism | (noun) a glandular disorder caused by excessive cortisol | Synonyms: Cushing's syndrome |
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| hypermenorrhea | (noun) abnormally heavy or prolonged menstruation; can be a symptom of uterine tumors and can lead to anemia if prolonged | Synonyms: menorrhagia |
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| hypervitaminosis | (noun) an abnormal condition resulting from taking vitamins excessively; can be serious for vitamins A or D or K | - |
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| hypnoanalysis | (noun) the use of hypnosis in conjunction with psychoanalysis | - |
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| hypnogenesis | (noun) the induction of sleep or hypnosis | - |
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| hypnogogic | (adjective) sleep inducing | Synonyms: hypnagogic, somniferous, somnific, soporiferous, soporific |
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| hypnoid | (adjective) of or relating to a state of sleep or hypnosis | - |
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| hypnopedia | (noun) teaching during sleep (as by using recordings to teach a foreign language to someone who is asleep) | Synonyms: sleep-learning |
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| hypnophobia | (noun) a morbid fear of falling asleep | - |
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| hypnosis | (noun) a state that resembles sleep but that is induced by suggestion | - |
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| hypnotherapy | (noun) the use of hypnosis in psychotherapy | - |
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| hypnotic | (adjective) of or relating to hypnosis | - |
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| (adjective) attracting and holding interest as if by a spell | Synonyms: mesmeric, mesmerizing, spellbinding |
| (noun) a drug that induces sleep | Synonyms: soporific |
| hypnotically | (adverb) by means of hypnotism | - |
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| hypnotise | (verb) induce hypnosis in | Synonyms: hypnotize, mesmerise, mesmerize |
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| hypnotised | (adjective) having your attention fixated as though by a spell | Synonyms: fascinated, hypnotized, mesmerised, mesmerized, spell-bound, spellbound, transfixed |
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| hypnotiser | (noun) a person who induces hypnosis | Synonyms: hypnotist, hypnotizer, mesmerist, mesmerizer |
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| hypnotism | (noun) the act of inducing hypnosis | Synonyms: mesmerism, suggestion |
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| hypnotist | (noun) a person who induces hypnosis | Synonyms: hypnotiser, hypnotizer, mesmerist, mesmerizer |
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| hypnotize | (verb) induce hypnosis in | Synonyms: hypnotise, mesmerise, mesmerize |
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| hypnotized | (adjective) having your attention fixated as though by a spell | Synonyms: fascinated, hypnotised, mesmerised, mesmerized, spell-bound, spellbound, transfixed |
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| hypnotizer | (noun) a person who induces hypnosis | Synonyms: hypnotiser, hypnotist, mesmerist, mesmerizer |
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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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| hypovitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: avitaminosis |
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| iconoclasm | (noun) the orientation of an iconoclast | - |
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| iconoclast | (noun) someone who attacks cherished ideas or traditional institutions | - |
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| (noun) a destroyer of images used in religious worship | Synonyms: image breaker |
| iconoclastic | (adjective) destructive of images used in religious worship; said of religions, such as Islam, in which the representation of living things is prohibited | - |
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| (adjective) characterized by attack on established beliefs or institutions | - |
| iconography | (noun) the images and symbolic representations that are traditionally associated with a person or a subject | - |
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| iconolatry | (noun) the worship of sacred images | - |
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| iconology | (noun) the branch of art history that studies visual images and their symbolic meaning (especially in social or political terms) | - |
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| iconoscope | (noun) the first practical television-camera for picture pickup; invented in 1923 by Vladimir Kosma Zworykin | - |
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| ignobility | (noun) the quality of being ignoble | Synonyms: ignobleness |
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| ignoble | (adjective) completely lacking nobility in character or quality or purpose | - |
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| (adjective) not of the nobility | Synonyms: ungentle, untitled |
| ignobleness | (noun) the quality of being ignoble | Synonyms: ignobility |
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| ignobly | (adverb) in a currish manner; meanspiritedly | Synonyms: currishly |
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| ignominious | (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, disgraceful, inglorious, opprobrious, shameful |
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| ignominiously | (adverb) in a dishonorable manner or to a dishonorable degree | Synonyms: discreditably, disgracefully, dishonorably, dishonourably, ingloriously, shamefully |
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| ignominiousness | (noun) unworthiness meriting public disgrace and dishonor | Synonyms: disgracefulness, shamefulness |
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| ignominy | (noun) a state of dishonor | Synonyms: disgrace, shame |
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| ignoramus | (noun) an ignorant person | Synonyms: know nothing, uneducated person |
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| ignorance | (noun) the lack of knowledge or education | - |
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| ignorant | (adjective) unaware because of a lack of relevant information or knowledge | Synonyms: unknowing, unknowledgeable, unwitting |
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| (adjective) uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field | Synonyms: illiterate |
| (adjective) uneducated in general; lacking knowledge or sophistication | Synonyms: nescient, unlearned, unlettered |
| ignorantly | (adverb) in ignorance; in an ignorant manner | - |
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| ignorantness | (noun) ignorance (especially of orthodox beliefs) | Synonyms: nescience, unknowing, unknowingness |
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| ignore | (verb) be ignorant of or in the dark about | - |
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| (verb) give little or no attention to | Synonyms: disregard, neglect |
| (verb) bar from attention or consideration | Synonyms: brush aside, brush off, discount, dismiss, disregard, push aside |
| (verb) refuse to acknowledge | Synonyms: cut, disregard, snub |
| (verb) fail to notice | - |
| ignored | (adjective) disregarded | Synonyms: neglected, unheeded |
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| iguanodon | (noun) massive herbivorous bipedal dinosaur with a long heavy tail; common in Europe and northern Africa; early Cretaceous period | - |
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| immunoassay | (noun) identification of a substance (especially a protein) by its action as an antigen | Synonyms: immunochemical assay |
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| immunochemical | (adjective) of or relating to immunochemistry | - |
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| immunochemistry | (noun) the field of chemistry concerned with chemical processes in immunology (such as chemical studies of antigens and antibodies) | Synonyms: chemoimmunology |
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| immunocompetence | (noun) the ability to develop an immune response following exposure to an antigen | - |
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| immunocompetent | (adjective) capable of developing an immune response following exposure to an antigen | - |
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| immunocompromised | (adjective) unable to develop a normal immune response usually because of malnutrition or immunodeficiency or immunosuppressive therapy | - |
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| immunodeficiency | (noun) immunological disorder in which some part of the body's immune system is inadequate and resistance to infectious diseases is reduced | - |
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| immunodeficient | (adjective) incapable of developing an immune response following exposure to an antigen | - |
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| immunoelectrophoresis | (noun) electrophoresis to separate antigens and antibodies | - |
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| immunofluorescence | (noun) (immunology) a technique that uses antibodies linked to a fluorescent dye in order to study antigens in a sample of tissue | - |
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| immunogen | (noun) any substance or organism that provokes an immune response (produces immunity) when introduced into the body | Synonyms: immunizing agent |
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| immunogenic | (adjective) possessing the ability to elicit an immune response | - |
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| immunogenicity | (noun) the property of eliciting an immune response | - |
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| immunoglobulin | (noun) a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response | Synonyms: Ig, immune gamma globulin, immune globulin, immune serum globulin |
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| immunohistochemistry | (noun) an assay that shows specific antigens in tissues by the use of markers that are either fluorescent dyes or enzymes (such as horseradish peroxidase) | - |
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| immunologic | (adjective) of or relating to immunology | Synonyms: immunological |
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