9-letter words containing a, e, r, o
- ideograph — an ideogram.
- idolaters — Plural form of idolater.
- ignorable — to refrain from noticing or recognizing: to ignore insulting remarks.
- ignorance — the state or fact of being ignorant; lack of knowledge, learning, information, etc.
- iminourea — guanidine.
- imperator — an absolute or supreme ruler.
- in reason — a basis or cause, as for some belief, action, fact, event, etc.: the reason for declaring war.
- incourage — Archaic form of encourage.
- indeavors — Plural form of indeavor.
- indeavour — Archaic form of endeavour.
- inoperant — Not operant.
- inquorate — (of an assembly) unable to proceed effectively because not enough members are present to make up a quorum.
- interloan — a loan between one library and another
- iron gate — a gorge cut by the Danube through the Carpathian Mountains, between Yugoslavia and SW Romania. 2 miles (3.2 km) long.
- irrorated — Simple past tense and past participle of irrorate.
- isocrates — 436–338 b.c, Athenian orator.
- isomerase — any of a class of enzymes that catalyze reactions involving intramolecular rearrangements.
- isopteran — a member of the order Isoptera which includes social, colonizing insects such as termites
- iteration — the act of repeating; a repetition.
- jack rope — a rope for bending the foot of a sail to a boom.
- jack rose — a cocktail made with apple brandy, lime or lemon juice, and grenadine.
- jamborees — Plural form of jamboree.
- jargoneer — a user of jargon
- jargonise — Alternative form of jargonize.
- jargonize — to talk jargon or a jargon.
- jasperous — Containing jasper, composed of jasper.
- jeoparded — Simple past tense and past participle of jeopard.
- jeoparder — a person who puts in jeopardy
- jerfalcon — Alternative form of gyrfalcon.
- jeroboams — Plural form of jeroboam.
- jetavator — an extension of the exhaust nozzle of a rocket, for controlling the direction of the exhaust gases.
- job share — If two people job share, they share the same job by working part-time, for example one person working in the mornings and the other in the afternoons.
- job-share — to share the responsibility and duties of a single full-time job with one or more other employees.
- jobstears — (used with a plural verb) the hard, nearly spherical bracts that surround the female flowers of an Asian grass, Coix lacryma-jobi, and which when ripe are used as beads.
- juniorate — a two-year course of study for a Jesuit novice in preparation for the course in philosophy.
- kairomone — A chemical substance emitted by an organism and detected by another of a different species that gains advantage from this, e.g., a parasite seeking a host.
- kaiserdom — The dignity, rank or office of a kaiser; the state of being a kaiser.
- karyocyte — (cytology) Any cell that has a nucleus.
- karyosome — Also called chromocenter. any of several masses of chromatin in the reticulum of a cell nucleus.
- karyotype — the chromosomes of a cell, usually displayed as a systematized arrangement of chromosome pairs in descending order of size.
- keratoses — having a skeleton formed of horny fibers, as certain sponges.
- keratosis — any skin disease characterized by a horny growth, as a wart.
- keratotic — any skin disease characterized by a horny growth, as a wart.
- ketonuria — the presence of ketone bodies in the urine.
- key largo — one of the islands in the Florida Keys. 30 miles (48 km) long; 2 miles (3.2 km) wide.
- keyboards — Plural form of keyboard.
- kiteboard — A specialized light weight wakeboard used for kiteboarding.
- kleopatra — Cleopatra (def 2).
- kneeboard — a short board for surfing or water-skiing in a kneeling position.
- l'allegro — L'Allegro.