12-letter words containing o, r, s, i
- airpocalypse — (informal) The presence of dense smog in many parts of China.
- algesiometer — an instrument for determining the sensitiveness of the skin to a painful stimulus.
- allegoristic — writing or using allegory; interpreting in an allegorical sense.
- allegrissimo — (music) A direction in musical notation indicating that the musical piece should be played very fast and lively.
- allomorphism — variation in the crystalline form of a chemical compound
- alstroemeria — any plant of the tuberous perennial liliaceous genus Alstroemeria, originally S American, grown for their brightly coloured orchid-like flowers
- altercations — Plural form of altercation.
- alternations — Plural form of alternation.
- ambidextrous — Someone who is ambidextrous can use both their right hand and their left hand equally skilfully.
- ambisextrous — Informal. sexually attracted to both sexes; bisexual. used by or suitable for either sex; unisex: ambisextrous hair styles.
- ambulatories — Plural form of ambulatory.
- amentiferous — bearing aments
- amortisation — Alternative spelling of amortization.
- amphicarpous — producing two kinds of fruit that differ either in form or in time of ripening.
- amphitropous — (of a plant ovule) partially inverted so that the base and the micropyle at the apex are the same distance from the funicle
- an iron fist — a cruel and unyielding attitude or approach
- anachronisms — Plural form of anachronism.
- anachronists — Plural form of anachronist.
- anaerobiosis — life in the absence of oxygen
- anamorphosis — an image or drawing distorted in such a way that it becomes recognizable only when viewed in a specified manner or through a special device
- anaphrodisia — diminished sexual desire.
- androgenesis — a type of reproduction in insects and plants involving the development of an embryo that contains only paternal chromosomes
- androscoggin — a river flowing from NE New Hampshire through SW Maine into the Kennebec River. 171 miles (275 km) long.
- anemotropism — orientation in response to a current of air.
- angiocarpous — being or having fruit contained in a vessel such as a shell
- angiosarcoma — a rare, malignant tumour which grows rapidly in the blood vessels
- animatronics — a branch of film and theatre technology that combines traditional puppetry techniques with electronics to create lifelike animated effects
- anisomorphic — differing in the semantic scope of terms referring to the real world: for instance, English and Russian are anisomorphic with regard to colour terms, English treating light blue and navy blue as shades of one colour but Russian treating these two shades as unrelated
- anisothermal — (thermodynamics) Of or pertaining to a system that is not in thermal equilibrium, that does not have a single fixed temperature.
- anisotropies — Plural form of anisotropy.
- anisotropism — the state of being anisotropic
- annunciators — Plural form of annunciator.
- anorthositic — resembling or consisting of anorthosite
- anteriorness — The state or quality of being anterior.
- anthologiser — Alternative spelling of anthologizer.
- anti-strophe — the part of an ancient Greek choral ode answering a previous strophe, sung by the chorus when returning from left to right.
- anticonsumer — opposed to consumerism
- antiestrogen — any of several major female sex hormones produced primarily by the ovarian follicles of female mammals, capable of inducing estrus, developing and maintaining secondary female sex characteristics, and preparing the uterus for the reception of a fertilized egg: used, especially in synthetic form, as a component of oral contraceptives, in certain cancer treatments, and in other therapies.
- antigropelos — waterproof leggings used to protect against mud
- antineutrons — Plural form of antineutron.
- antiroyalism — Opposition to royals or royalism.
- antiroyalist — opposed to the monarchy
- antistrophes — Plural form of antistrophe.
- antistrophic — Of or pertaining to an antistrophe.
- antistrophon — an argument that is retorted against an opponent
- anton sailer — Anton [ahn-tohn] /ˈɑn toʊn/ (Show IPA), ("Toni") 1935–2009, Austrian skier.
- aphoristical — Alternative form of aphoristic.
- aphrodisiacs — Plural form of aphrodisiac.
- apostle bird — a gregarious grey-and-brown Australian nest-building bird, Struthidea cinerea
- apostrophise — to address by apostrophe.