12-letter words containing c, o, i, s
- amniotic sac — membrane around embryo or foetus
- amphicarpous — producing two kinds of fruit that differ either in form or in time of ripening.
- amphicoelous — (of the vertebrae of most fishes and some amphibians) concave at the anterior and posterior ends
- anachronisms — Plural form of anachronism.
- anachronists — Plural form of anachronist.
- androscoggin — a river flowing from NE New Hampshire through SW Maine into the Kennebec River. 171 miles (275 km) long.
- anecdotalism — an inclination to relate anecdotes
- 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
- animalculous — a minute or microscopic animal, nearly or quite invisible to the naked eye, as an infusorian or rotifer.
- animatronics — a branch of film and theatre technology that combines traditional puppetry techniques with electronics to create lifelike animated effects
- anisocytosis — (medicine) Significant size variation of blood cells.
- 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
- annunciators — Plural form of annunciator.
- anorthositic — resembling or consisting of anorthosite
- antagonistic — If a person is antagonistic to someone or something, they show hatred or dislike towards them.
- anthocyanins — Plural form of anthocyanin.
- anticathodes — Plural form of anticathode.
- antichthones — the antipodes
- anticonsumer — opposed to consumerism
- anticyclones — Plural form of anticyclone.
- antinucleons — Plural form of antinucleon.
- antiochus iv — ?215–164 bc, Seleucid king of Syria (175–164), who attacked the Jews and provoked the revolt of the Maccabees
- antipolitics — the rejection of party and electoral politics
- antisociable — Antisocial.
- antisocially — In an antisocial manner.
- antistrophic — Of or pertaining to an antistrophe.
- aphoristical — Alternative form of aphoristic.
- aphrodisiacs — Plural form of aphrodisiac.
- apocalyptist — the writer of the Apocalypse or a related work
- apostolicity — the quality of being apostolic
- apothecaries — Plural form of apothecary.
- applications — Plural form of application.
- appreciators — to be grateful or thankful for: They appreciated his thoughtfulness.
- archdiocesan — Relating to an archdiocese.
- archdioceses — Plural form of archdiocese.
- archeologist — archaeology.
- archesporial — the primitive cell, or group of cells, that give rise to the cells from which spores are derived.
- archesporium — archespore.
- archibenthos — the ocean bottom between the littoral and abyssal zones: from depths of approximately 200 feet (60 meters) to 3300 feet (1000 meters).
- archipelagos — Plural form of archipelago.
- archosaurian — belonging to or characteristic of the archosaurs
- arctophilist — a collector of teddy bears
- argillaceous — (of sedimentary rocks and deposits) composed of very fine-grained material, such as clay, shale, etc
- aristocratic — Aristocratic means belonging to or typical of the aristocracy.
- aristolochia — any of various plants of the genus Aristolochia of the family Aristolochiaceae
- aristophanic — 448?–385? b.c, Athenian comic dramatist.
- arthroscopic — the use of an arthroscope to diagnose an injury to or disease of a joint or to perform minor surgery on a joint.
- articulators — Plural form of articulator.
- artiodactyls — Plural form of artiodactyl.