9-letter words containing p, i, r, o
- ideograph — an ideogram.
- idiograph — a mark or signature characteristic of a particular person, organization, etc.; trademark. Compare logotype (def 2).
- imperator — an absolute or supreme ruler.
- imperious — domineering in a haughty manner; dictatorial; overbearing: an imperious manner; an imperious person.
- imploring — to beg urgently or piteously, as for aid or mercy; beseech; entreat: They implored him to go.
- important — of much or great significance or consequence: an important event in world history.
- importers — Plural form of importer.
- importing — Present participle of import.
- importune — to press or beset with solicitations; demand with urgency or persistence.
- imposters — Plural form of imposter.
- impostors — Plural form of impostor.
- imposture — the action or practice of imposing fraudulently upon others.
- impounder — One who impounds.
- imprisons — Third-person singular simple present indicative form of imprison.
- improbity — lack of honesty or moral scruples.
- impromptu — made or done without previous preparation: an impromptu address to the unexpected crowds.
- improving — to bring into a more desirable or excellent condition: He took vitamins to improve his health.
- improvise — to compose and perform or deliver without previous preparation; extemporize: to improvise an acceptance speech.
- improviso — (obsolete) Not prepared beforehand; unpremeditated; extemporaneous.
- improvize — Alternative spelling of improvise.
- in person — a human being, whether an adult or child: The table seats four persons.
- in-person — a human being, whether an adult or child: The table seats four persons.
- incorrupt — not corrupt; not debased or perverted; morally upright.
- inoperant — Not operant.
- inotropic — influencing the contractility of muscular tissue.
- inpouring — The action of pouring something in; an infusion.
- inspector — a person who inspects.
- intercrop — to grow one crop between the rows of another, as in an orchard or field.
- interloop — Between loops.
- interlope — to intrude into some region or field of trade without a proper license.
- interpone — to interpose
- interpose — to place between; cause to intervene: to interpose an opaque body between a light and the eye.
- ionophore — a lipid-soluble substance capable of transporting specific ions through cellular membranes.
- ionotropy — the reversible interconversion of a pair of organic isomers as a result of the migration of an ionic part of the molecule
- iprindole — a tricyclic antidepressant drug. Formula: C19H28N2
- ipso jure — by the law itself; by operation of law.
- irruption — a breaking or bursting in; a violent incursion or invasion.
- isentrope — a line on a map or chart joining points having equal entropy.
- isocarpic — having carpels equal in number to the other floral parts.
- isomorphs — Plural form of isomorph.
- isopropyl — containing the isopropyl group.
- isopteran — a member of the order Isoptera which includes social, colonizing insects such as termites
- isotropic — Physics. of equal physical properties along all axes. Compare anisotropic (def 1).
- ivorytype — an antiquated photoprinting technique in which two prints are made of the same image, and the weaker one, made transparent with varnish and colored on the back, is laid over the stronger one.
- kingsport — a city in NE Tennessee.
- kropotkin — Prince Pëter Alekseevich [pyawtr uh-lyi-ksyey-yi-vyich] /ˈpyɔtr ʌ lyɪˈksyeɪ yɪ vyɪtʃ/ (Show IPA), 1842–1921, Russian geographer, author, and anarchist.
- lamproite — (geology) Any of several volcanic rocks having a high potassium content.
- leporidae — an animal of the family Leporidae, comprising the rabbits and hares.
- leprosity — the state of being leprous
- lie group — a topological group that is a manifold.