| 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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| hyponym | (noun) a word that is more specific than a given word | Synonyms: subordinate, subordinate word |
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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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| hypothyroidism | (noun) an underactive thyroid gland; a glandular disorder resulting from insufficient production of thyroid hormones | - |
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| hysterosalpingogram | (noun) X ray of the uterus and Fallopian tubes; usually done in diagnosing infertility (to see if there any blockages) | - |
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| ibidem | (adverb) in the same place (used when citing a reference) | Synonyms: ib., ibid. |
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| icecream | (noun) frozen dessert containing cream and sugar and flavoring | Synonyms: ice cream |
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| iconoclasm | (noun) the orientation of an iconoclast | - |
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| idealism | (noun) impracticality by virtue of thinking of things in their ideal form rather than as they really are | - |
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| (noun) elevated ideals or conduct; the quality of believing that ideals should be pursued | Synonyms: high-mindedness, noble-mindedness |
| (noun) (philosophy) the philosophical theory that ideas are the only reality | - |
| ideogram | (noun) a graphic character that indicates the meaning of a thing without indicating the sounds used to say it | Synonyms: ideograph |
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| idiom | (noun) the style of a particular artist or school or movement | Synonyms: artistic style |
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| (noun) the usage or vocabulary that is characteristic of a specific group of people | Synonyms: accent, dialect |
| (noun) an expression whose meanings cannot be inferred from the meanings of the words that make it up | Synonyms: idiomatic expression, phrasal idiom, phrase, set phrase |
| (noun) a manner of speaking that is natural to native speakers of a language | Synonyms: parlance |
| ileum | (noun) the part of the small intestine between the jejunum and the cecum | - |
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| ilium | (noun) the upper and widest of the three bones making up the hipbone | - |
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| imagism | (noun) a movement by American and English poets early in the 20th century in reaction to Victorian sentimentality; used common speech in free verse with clear concrete imagery | - |
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| imam | (noun) (Islam) the man who leads prayers in a mosque; for Shiites an imam is a recognized authority on Islamic theology and law and a spiritual guide | Synonyms: imaum |
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| imaum | (noun) (Islam) the man who leads prayers in a mosque; for Shiites an imam is a recognized authority on Islamic theology and law and a spiritual guide | Synonyms: imam |
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| imperialism | (noun) any instance of aggressive extension of authority | - |
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| (noun) a political orientation that advocates imperial interests | - |
| (noun) a policy of extending your rule over foreign countries | - |
| imperium | (noun) supreme authority; absolute dominion | - |
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| (noun) the domain ruled by an emperor or empress; the region over which imperial dominion is exercised | Synonyms: empire |
| incendiarism | (noun) malicious burning to destroy property | Synonyms: arson, fire-raising |
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| inchworm | (noun) small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae | Synonyms: looper, measuring worm |
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| indecorum | (noun) an act of undue intimacy | Synonyms: familiarity, impropriety, liberty |
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| (noun) a lack of decorum | Synonyms: indecorousness |
| indium | (noun) a rare soft silvery metallic element; occurs in small quantities in sphalerite | Synonyms: atomic number 49, In |
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| individualism | (noun) the quality of being individual | Synonyms: individuality, individuation |
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| (noun) the doctrine that government should not interfere in commercial affairs | Synonyms: laissez faire |
| (noun) a belief in the importance of the individual and the virtue of self-reliance and personal independence | - |
| inductionism | (noun) the scientific philosophy where laws are "induced" from sets of data. | - |
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| indumentum | (noun) a covering of fine hairs (or sometimes scales) as on a leaf or insect | Synonyms: indument |
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| indusium | (noun) a membrane enclosing and protecting the developing spores especially that covering the sori of a fern | - |
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| industrialism | (noun) an economic system built on large industries rather than on agriculture or craftsmanship | - |
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| infantilism | (noun) infantile behavior in mature persons | - |
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| (noun) an abnormal condition in which an older child or adult retains infantile characteristics | - |
| infirm | (adjective) lacking bodily or muscular strength or vitality | Synonyms: debile, decrepit, feeble, rickety, sapless, weak, weakly |
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| (adjective) lacking firmness of will or character or purpose | - |
| inform | (verb) give character or essence to | - |
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| (verb) impart knowledge of some fact, state of affairs, or event to | - |
| (verb) act as an informer | - |
| infundibulum | (noun) any of various funnel-shaped parts of the body (but especially the hypophyseal stalk) | - |
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| initialism | (noun) an abbreviation formed from the initial letters of the several words in the name and pronounced separately | - |
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| (noun) a word formed from the initial letters of the several words in the name and pronounced as one word | Synonyms: acronym |
| inoculum | (noun) a substance (a virus or toxin or immune serum) that is introduced into the body to produce or increase immunity to a particular disease | Synonyms: inoculant |
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| instrumentalism | (noun) a system of pragmatic philosophy that considers idea to be instruments that should guide our actions and their value is measured by their success | - |
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| insularism | (noun) the state of being isolated or detached | Synonyms: detachment, insularity, insulation |
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| insurrectionism | (noun) the principle of revolt against constituted authority | - |
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| intercom | (noun) a communication system linking different rooms within a building or ship etc | Synonyms: intercommunication system |
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| interim | (adjective) serving during an intermediate interval of time | - |
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| (noun) the time between one event, process, or period and another | Synonyms: lag, meantime, meanwhile |
| internationalism | (noun) quality of being international in scope | Synonyms: internationality |
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| (noun) the doctrine that nations should cooperate because their common interests are more important than their differences | - |
| interregnum | (noun) the time between two reigns, governments, etc. | - |
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| introspectionism | (noun) a doctrine that psychology must be based essentially on data derived from introspection. | - |
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| intuitionism | (noun) (philosophy) the doctrine that knowledge is acquired primarily by intuition | - |
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| invalidism | (noun) chronic ill health | - |
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| iodoform | (noun) a yellowish crystalline solid with a penetrating odor; sometimes used as an antiseptic dressing | Synonyms: triiodomethane |
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| (noun) sweet smelling yellow solid haloform CHI3 | Synonyms: tri-iodomethane |
| ipsedixitism | (noun) an unsupported dogmatic assertion | Synonyms: ipse dixit |
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| iridium | (noun) a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium | Synonyms: atomic number 77, Ir |
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| irredentism | (noun) the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related | Synonyms: irridentism |
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| irridentism | (noun) the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related | Synonyms: irredentism |
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| isarithm | (noun) a line drawn on a map connecting points having the same numerical value of some variable | Synonyms: isogram, isopleth |
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| ischium | (noun) one of the three sections of the hipbone; situated below the ilium | Synonyms: ischial bone, os ischii |
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| ism | (noun) a belief (or system of beliefs) accepted as authoritative by some group or school | Synonyms: doctrine, philosophical system, philosophy, school of thought |
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| isocheim | (noun) a line on a map connecting places with the same mean winter temperature. | - |
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| isochronism | (noun) the property of occuring regularly at equal time intervals, of maintaining a constant period or interval, despite variations in other measurable factors in the same system. | - |
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| isogeotherm | (noun) an isogram connecting points of equal temperature below the surface of the earth. | - |
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| isogram | (noun) a line drawn on a map connecting points having the same numerical value of some variable | Synonyms: isarithm, isopleth |
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| isolationism | (noun) a policy of nonparticipation in international economic and political relations | - |
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| isomerism | (noun) the state of being an isomer; the complex of chemical and physical phenomena characteristic of isomers | - |
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| isomorphism | (noun) (biology) similarity or identity of form or shape or structure | Synonyms: isomorphy |
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| isosyllabism | (noun) (linguistics, poetry) the use of isosyllabic verse. | - |
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| isotherm | (noun) (meteorology) an isogram connecting points having the same temperature at a given time | - |
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| item | (noun) a whole individual unit; especially when included in a list or collection | - |
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| (noun) an isolated fact that is considered separately from the whole | Synonyms: detail, point |
| (noun) a distinct part that can be specified separately in a group of things that could be enumerated on a list | Synonyms: point |
| (noun) an individual instance of a type of symbol | Synonyms: token |
| (noun) a small part that can be considered separately from the whole | Synonyms: detail, particular |
| (adverb) (used when listing or enumerating items) also | - |
| jam | (noun) deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems | Synonyms: electronic jamming, jamming |
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| (noun) preserve of crushed fruit | - |
| (noun) a dense crowd of people | Synonyms: crush, press |
| (noun) informal terms for a difficult situation | Synonyms: fix, hole, kettle of fish, mess, muddle, pickle |
| (verb) interfere with or prevent the reception of signals | Synonyms: block |
| (verb) crowd or pack to capacity | Synonyms: chock up, cram, jampack, ram, wad |
| (verb) get stuck and immobilized | - |
| (verb) block passage through | Synonyms: block, close up, impede, obstruct, obturate, occlude |
| (verb) crush or bruise | Synonyms: crush |
| (verb) press tightly together or cram | Synonyms: mob, pack, pile, throng |
| (verb) push down forcibly | - |
| jejunum | (noun) the part of the small intestine between the duodenum and the ileum | - |
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| jeroboam | (noun) a large wine bottle (holds 4/5 of a gallon) | Synonyms: double-magnum |
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| jetsam | (noun) the floating wreckage of a ship | Synonyms: flotsam |
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| (noun) the part of a ship's equipment or cargo that is thrown overboard to lighten the load in a storm | - |
| jibboom | (noun) a spar that extends the bowsprit | - |
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| jingoism | (noun) fanatical patriotism | Synonyms: chauvinism, superpatriotism, ultranationalism |
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| (noun) an appeal intended to arouse patriotic emotions | Synonyms: flag waving |
| jointworm | (noun) larva of chalcid flies injurious to the straw of wheat and other grains | Synonyms: strawworm |
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| jorum | (noun) a large drinking bowl | - |
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| (noun) the quantity that a jorum will hold. | - |
| journalism | (noun) the profession of reporting or photographing or editing news stories for one of the media | - |
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| (noun) newspapers and magazines collectively | Synonyms: news media |
| kabbalism | (noun) adherence to some extreme traditional theological concept or interpretation | Synonyms: cabalism |
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| karyoplasm | (noun) the protoplasm that constitutes the nucleus of a cell | Synonyms: nucleoplasm |
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| katabolism | (noun) breakdown in living organisms of more complex substances into simpler ones together with release of energy | Synonyms: catabolism, destructive metabolism, dissimilation |
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| katamorphism | (noun) metamorphism that occurs at or near the earth's surface; breaks down complex minerals into simpler ones | - |
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| kettledrum | (noun) a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it | Synonyms: kettle, timpani, tympani, tympanum |
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| keurboom | (noun) tree with odd-pinnate leaves and racemes of fragrant pink to purple flowers | Synonyms: Virgilia capensis, Virgilia oroboides |
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| (noun) fast-growing roundheaded tree with fragrant white to deep rose flowers; planted as an ornamental | Synonyms: Virgilia divaricata |
| khoum | (noun) 5 khoums equal 1 ouguiya in Mauritania | - |
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| kilogram | (noun) one thousand grams; the basic unit of mass adopted under the Systeme International d'Unites | Synonyms: kg, kilo |
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| kingdom | (noun) a basic group of natural objects | - |
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| (noun) a monarchy with a king or queen as head of state | - |
| (noun) the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia | - |
| (noun) the domain ruled by a king or queen | Synonyms: realm |
| (noun) a country with a king as head of state | - |
| (noun) a domain in which something is dominant | Synonyms: land, realm |
| km | (noun) a metric unit of length equal to 1000 meters (or 0.621371 miles) | Synonyms: kilometer, kilometre, klick |
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| labdanum | (noun) a soft blackish-brown resinous exudate from various rockroses used in perfumes especially as a fixative | Synonyms: ladanum |
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| (noun) a dark brown to greenish oleoresin that has a fragrant odor and is used as a fixative in perfumes; obtained as a juice from certain rockroses | Synonyms: gum labdanum |
| labium | (noun) a liplike structure that bounds a bodily orifice (especially any of the four labiate folds of a woman's vulva) | - |
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| laconicism | (noun) terseness of expression | Synonyms: laconism |
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| laconism | (noun) terseness of expression | Synonyms: laconicism |
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| ladanum | (noun) a soft blackish-brown resinous exudate from various rockroses used in perfumes especially as a fixative | Synonyms: labdanum |
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| lam | (noun) a rapid escape (as by criminals) | Synonyms: getaway |
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| (verb) give a thrashing to; beat hard | Synonyms: flail, thrash, thresh |
| (verb) flee; take to one's heels; cut and run | Synonyms: break away, bunk, escape, fly the coop, head for the hills, hightail it, run, run away, scarper, scat, take to the woods, turn tail |
| lambdacism | (noun) speech defect involving excessive use or unusual pronunciation of the phoneme `l' | - |
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| lanthanum | (noun) a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth | Synonyms: atomic number 57, La |
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| laryngospasm | (noun) a closure of the larynx that blocks the passage of air to the lungs | - |
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| latergram | (noun) a photo to be posted to Instagram at a later date | - |
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| laudanum | (noun) narcotic consisting of an alcohol solution of opium or any preparation in which opium is the main ingredient | Synonyms: tincture of opium |
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| lawrencium | (noun) a radioactive transuranic element synthesized from californium | Synonyms: atomic number 103, Lr |
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| lcm | (noun) the smallest multiple that is exactly divisible by every member of a set of numbers | Synonyms: least common multiple, lowest common multiple |
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| lebensraum | (noun) space sought for occupation by a nation whose population is expanding | Synonyms: living space |
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| leftism | (noun) the ideology of the political left; belief in or support of the tenets of the political left | - |
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| legalism | (noun) strict conformity to the letter of the law rather than its spirit | - |
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| lentiform | (adjective) convex on both sides; shaped like a lentil | Synonyms: biconvex, convexo-convex, lenticular |
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| leptosporangium | (noun) a sporangium formed from a single epidermal cell; characteristic of the Filicales or of almost all modern ferns | - |
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| lesbianism | (noun) female homosexuality | Synonyms: sapphism |
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| liberalism | (noun) a political orientation that favors social progress by reform and by changing laws rather than by revolution | - |
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| (noun) an economic theory advocating free competition and a self-regulating market | - |