9-letter words containing a, e, r, o
- autospore — a nonmotile algal spore that develops adult characteristics before being released
- autotimer — a device for turning a system on and off automatically at times predetermined by advance setting
- auxometer — an instrument measuring the magnifying power of lenses
- auxospore — a diatom cell before its silicaceous cell wall is formed
- averroism — the teachings of Averroës
- aversions — Plural form of aversion.
- avicebron — (Solomon ben Judah ibn-Gabirol) 1021?–58, Jewish poet and philosopher in Spain.
- ayr stone — a fine-grained stone used for polishing marble and as a whetstone.
- azeotrope — a mixture of liquids that boils at a constant temperature, at a given pressure, without change of composition
- azeotropy — the existence of azeotropes
- aztreonam — A synthetic monobactam originally isolated from Chromobacterium violaceum, similar in action to penicillin.
- baal kore — an official in the synagogue, as a cantor, who reads the weekly portion of the Torah.
- baboonery — uncouth or brutish behaviour
- bachelors — Plural form of bachelor.
- bachelour — Obsolete form of bachelor.
- backorder — Commerce. an order or part of an order waiting to be filled.
- backshore — the area of a beach above the usual high tide mark
- bacterio- — indicating bacteria or an action or condition relating to or characteristic of bacteria
- bacteroid — resembling a bacterium
- baignoire — a theatre box on the lowest level
- bakeboard — a board on which bread dough is rolled and kneaded
- balloters — Plural form of balloter.
- baltimore — a port in N Maryland, on Chesapeake Bay. Pop: 628 670 (2003 est)
- band-role — a small flag or streamer fastened to a lance, masthead, etc.
- bandalore — an old-fashioned type of yo-yo
- banderole — a long narrow flag, usually with forked ends, esp one attached to the masthead of a ship; pennant
- bandoleer — a broad belt worn over one shoulder and across the chest, with pockets for carrying ammunition, etc.
- bandolero — a highwayman; a robber
- bandolier — a soldier's broad shoulder belt having small pockets or loops for cartridges
- bangalore — a city in S India, capital of Karnataka state: printing, textiles, pharmaceuticals. Pop: 4 292 223 (2001)
- bannerols — Plural form of bannerol.
- barberton — a city in NE Ohio.
- barbitone — a long-acting barbiturate used medicinally, usually in the form of the sodium salt, as a sedative or hypnotic
- barbotine — a type of clay paste used in making decorated pottery
- barcarole — a Venetian boat song in a time of six or twelve quaver beats to the bar
- barcelona — the chief port of Spain, on the NE Mediterranean coast: seat of the Republican government during the Civil War (1936–39); the commercial capital of Spain. Pop: 1 582 738 (2003 est)
- bare-root — of or relating to a tree or shrub prepared for transplanting by having all or most of the soil removed from about its roots.
- bareboned — short of resources
- barenboim — Daniel. born 1942, Israeli concert pianist and conductor, born in Argentina
- bargepole — a long pole used to propel a barge
- barhopped — Simple past tense and past participle of barhop.
- baritones — Plural form of baritone.
- barklouse — any of numerous insects of the order Psocoptera that live on the bark of trees and other plants.
- barometer — A barometer is an instrument that measures air pressure and shows when the weather is changing.
- barometre — (nonstandard) Alternative form of barometer.
- barometry — the process of measuring atmospheric pressure.
- baronetcy — the rank, position, or patent of a baronet
- barophile — An organism that lives and thrives under high barometric pressure; a form of extremophile.
- baroquely — in a baroque fashion
- baroscope — any instrument for measuring atmospheric pressure, esp a manometer with one side open to the atmosphere