11-letter words containing r, e, a, c, o
- 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
- 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.
- archipelago — An archipelago is a group of islands, especially small islands.
- architector — (obsolete) An architect.
- arctic zone — the section of the earth's surface lying between the Arctic Circle and the North Pole.
- area office — a part of a business, organization, etc which is the most important office in a specific geographical area
- 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
- armored car — any of various vehicles covered with armor plate, as a truck for carrying money to or from a bank
- ars poetica — the art of poetry
- art college — a college at which students study and make art of various kinds, such as drawing, painting and sculpture
- arthrectomy — surgical excision of a joint
- arthroscope — a tubular instrument that is inserted into the capsule of a joint to examine the joint, extract tissue, etc
- as concerns — in regard to; with reference to; about
- asteraceous — belonging to the Asterasceae, an alternative name for the plant family Compositae.
- astromancer — divination by means of the stars.
- astrometric — (astronomy) of or relating to astrometry.
- atherectomy — the removal of plaque from an artery by means of a tiny rotating cutting blade inserted through a catheter.
- atherogenic — causing atheroma
- atmospheric — Atmospheric is used to describe something which relates to the Earth's atmosphere.
- attic order — a low pilaster of any order set into the cornice of a building
- auctioneers — Plural form of auctioneer.
- audiometric — the testing of hearing by means of an audiometer.
- auto-erotic — producing sexual excitement or pleasure without association with another person or external stimulation.
- autochanger — a device in a record player or CD player that enables a small stack of records or CDs to be dropped automatically onto the turntable or player tray one at a time and played separately
- autocorrect — a function that attempts to correct errors made by the user when entering text into an electronic device
- autocracies — Plural form of autocracy.
- axonometric — of or relating to a projection method of representing three-dimensional objects on a flat surface
- azotobacter — any bacterium of the family Azotobacteriaceae, important in nitrogen fixation in the soil
- bacciferous — bearing berries
- bachelordom — the state of being a bachelor; bachelorhood
- bachelorism — bachelorhood
- back boiler — a tank or series of pipes at the back of a fireplace for heating water
- backcrossed — Simple past tense and past participle of backcross.
- backcrosses — Plural form of backcross.
- backstopper — a wall, wire screen, or the like, serving to prevent a ball from going too far beyond the normal playing area.
- backstroker — a person who swims the backstroke, especially a member of a competitive swimming team who specializes in the backstroke.
- backstrokes — Plural form of backstroke.
- baconburger — a hamburger topped with strips of cooked bacon.
- bacteriocin — any protein-based toxin given off by bacteria to prevent the growth of related bacteria nearby
- bacteriosis — any bacterial disease
- bacteroides — any of several rod-shaped, anaerobic bacteria of the genus Bacteroides, occurring in the alimentary and genitourinary tracts of humans and other mammals, certain species of which are pathogenic.
- badderlocks — a seaweed, Alaria esculenta, that has long brownish-green fronds and is eaten in parts of N Europe
- bar cocheba — Simon, died a.d. 135, Hebrew leader of insurrection against the Romans a.d. 132–135.