11-letter words starting with ar
- archdukedom — the territory ruled by an archduke or archduchess
- archegonial — relating to an archegonium
- archegonium — a female sex organ, occurring in mosses, spore-bearing vascular plants, and gymnosperms, that produces a single egg cell in its swollen base
- archenemies — Plural form of archenemy.
- archenteric — Of or pertaining to an archenteron.
- archenteron — the cavity within an embryo at the gastrula stage of development that eventually becomes the digestive cavity
- archeologic — (American spelling) alternative spelling of archaeologic.
- archeometry — the branch of archaeology that deals with the dating of archaeological specimens through specific techniques, as radiocarbon dating and amino-acid dating.
- archicortex — (anatomy) Part of the allocortex, specifically three layered hippocampal cortexes necessary for hippocampus formation.
- archilochus — 7th century bc, Greek poet of Paros, notable for using his own experience as subject matter
- archimedean — of, relating to, or discovered by Archimedes.
- archipelago — An archipelago is a group of islands, especially small islands.
- architected — a person who engages in the profession of architecture.
- architector — (obsolete) An architect.
- architraved — having an architrave or architraves
- architraves — Plural form of architrave.
- archliberal — extremely liberal, especially in political thinking.
- archnemesis — A chief nemesis.
- archpriests — Plural form of archpriest.
- archtraitor — A chief or transcendent traitor.
- archvillain — A supreme villain; the most evil or powerful villain.
- arctic char — a char, Salvelinus alpinus, that occurs in northern and arctic seas
- arctic hare — a large hare, Lepus arcticus, of the Canadian Arctic whose fur is white in winter
- arctic seal — rabbit fur that has been sheared and dyed to simulate sealskin.
- arctic skua — a predatory gull-like bird, Stercorarius parasiticus, which harasses terns or gulls into dropping or disgorging fish they have caught; it breeds in northern Eurasia and North America
- arctic tern — a black-capped tern, Sterna paradisea, that breeds in the Arctic and then migrates as far south as the Antarctic
- arctic zone — the section of the earth's surface lying between the Arctic Circle and the North Pole.
- arcticology — the scientific study of the Polar Regions.
- arctophilia — the practice of collecting teddy bears
- arduousness — requiring great exertion; laborious; difficult: an arduous undertaking.
- area office — a part of a business, organization, etc which is the most important office in a specific geographical area
- arena stage — the central acting area found in a theatre-in-the-round
- arenicolous — growing or living in sand or sandy places
- areocentric — relating to a reference system which has Mars as its centre
- areographic — relating to areography
- argand lamp — an oil lamp with a chimney, having a tubular wick that permits air to reach the center of the flame.
- argentinean — a native or inhabitant of Argentina.
- argentinian — Argentinian means belonging or relating to Argentina or its people.
- argumentive — argumentative
- argyllshire — (until 1975) a county of W Scotland, part of Strathclyde region (1975–96), now part of Argyll and Bute
- ari service — (company) The trading name of the remnants of AST Research, Inc.. ARI Services is a wholly owned subsidiary of Samsung Electronics Co. Ltd., of Seoul, Korea. They no longer manufacture or distribute computer hardware, but they continue to provide worldwide technical and service support to owners of systems that they manufactured. Headquarters: 16225 Alton Parkway, POB 57005, Irvine, California 92619-7005, USA.
- aristarchus — a crater in the NE quadrant of the moon, having a diameter of about 37 kilometres, which is the brightest formation on the moon
- aristocracy — The aristocracy is a class of people in some countries who have a high social rank and special titles.
- aristocrats — Plural form of aristocrat.
- aristoteles — a walled plain in the first quadrant of the face of the moon: about 60 miles (97 km) in diameter.
- arith-matic — (language) An extension of Grace Hopper's A-2 programming language, developed in about 1955. ARITH-MATIC was originally known as A-3, but was renamed by the marketing department of Remington Rand UNIVAC.
- arithmetics — Plural form of arithmetic.
- arkadelphia — a city in central Arkansas.
- arkansawyer — an Arkansan.
- arkeologist — Someone who studies the story of Noah's Ark, particularly by searching for physical evidence which would corroborate it.