13-letter words containing r, o, t, u
- hunter's moon — the first full moon following the harvest moon in late September or early October.
- hunter's robe — pothos.
- hunting sword — a short, light saber of the 18th century, having a straight or slightly curved blade.
- hydrofracture — (geology) Rock fracture caused by the pressure of freezing water.
- hydrosulphate — a salt formed by the direct union of sulfuric acid with an organic base, especially an alkaloid, and usually more soluble than the base.
- hydrosulphite — hyposulfite (def 1).
- hydrotelluric — (chemistry) Formed by hydrogen and tellurium.
- hymenopterous — belonging or pertaining to the Hymenoptera, an order of insects having, when winged, four membranous wings, and comprising the wasps, bees, ants, ichneumon flies, and sawflies.
- hypercautious — Especially or unreasonably cautious.
- hyperfunction — abnormally increased function, especially of glands or other organs.
- hypermutation — (uncountable) Frequent mutation.
- hypertrophous — relating to hypertrophy
- hyracotherium — eohippus.
- hysteranthous — relating to a plant whose flowers open before its leaves
- ichthyosaurus — ichthyosaur.
- illocutionary — pertaining to a linguistic act performed by a speaker in producing an utterance, as suggesting, warning, promising, or requesting.
- illuminometer — an instrument for measuring illumination.
- illustrations — Plural form of illustration.
- illustriously — highly distinguished; renowned; famous: an illustrious leader.
- illustrissimo — most illustrious (esp as belonging to the Italian aristocracy)
- immunosorbent — an insoluble surface to which a specific antibody is attached for the purpose of removing the corresponding antigen from a solution or suspension.
- immunotherapy — treatment designed to produce immunity to a disease or enhance the resistance of the immune system to an active disease process, as cancer.
- importunately — urgent or persistent in solicitation, sometimes annoyingly so.
- importunities — Plural form of importunity.
- inaugurations — Plural form of inauguration.
- inclinatorium — an instrument invented by Robert Norman in 1576, used to determine the degree to which a magnetic needle dips towards the earth; a dipping needle
- incongruently — not congruent.
- incongruities — the quality or condition of being incongruous.
- inconstruable — unable to be construed
- incorruptable — Misspelling of incorruptible.
- incorruptible — not corruptible: incorruptible integrity.
- incorruptibly — In an incorruptible manner.
- incorruptness — The state of being incorrupt.
- incouragement — Archaic form of encouragement.
- inculturation — enculturation.
- indolebutyric — as in indolebutyric acid, a synthetic plant growth regulator
- inductothermy — the production of fever by means of electromagnetic induction.
- industriously — working energetically and devotedly; hard-working; diligent: an industrious person.
- infostructure — The technical infrastructure supporting an information system.
- infructuously — in an infructuous or unfruitful manner; fruitlessly
- ingurgitation — The act of swallowing greedily or immoderately; that which is so swallowed.
- inner product — Also called dot product, scalar product. the quantity obtained by multiplying the corresponding coordinates of each of two vectors and adding the products, equal to the product of the magnitudes of the vectors and the cosine of the angle between them.
- inns of court — (in England) the four private unincorporated societies in London that function as a law school and have the exclusive privilege of calling candidates to the English bar
- inobtrusively — in an unobtrusive manner
- inopportunely — In an inopportune manner.
- inopportunity — not opportune; inappropriate; inconvenient; untimely or unseasonable: an inopportune visit.
- inquisitorial — of or relating to an inquisitor or inquisition.
- insectivorous — adapted to feeding on insects.
- instructional — the act or practice of instructing or teaching; education.
- insubordinate — not submitting to authority; disobedient: an insubordinate soldier.