12-letter words containing r, o
- binocularity — binocular characteristics
- bio-organism — a dangerous fast-proliferating organism that could be used as the basis of a biological weapon
- bio-security — the precautions taken to protect against the spread of lethal or harmful organisms and diseases
- bioastronomy — the branch of biology which deals with the study or the discovery of life forms on other planets or in space
- biochemistry — Biochemistry is the study of the chemical processes that happen in living things.
- biocorrosion — corrosion caused by or enhanced by bacteria or other microorganisms; biologically induced corrosion.
- biodiversity — Biodiversity is the existence of a wide variety of plant and animal species living in their natural environment.
- biogeography — the branch of biology concerned with the geographical distribution of plants and animals
- biographical — Biographical facts, notes, or details are concerned with the events in someone's life.
- biohazardous — a pathogen, especially one used in or produced by biological research.
- bioinorganic — pertaining to the biological activity of metal complexes and nonmetal compounds based on elements other than carbon (contrasted with bioorganic).
- biometrician — a person who is knowledgeable about biometry
- biomolecular — relating to a biomolecule
- biorhythmics — the study of biorhythms
- biotelemetry — the monitoring of biological functions in humans or animals by means of a miniature transmitter that sends data to a distant point to be read by electronic instruments
- bioterrorism — Bioterrorism is terrorism that involves the use of biological weapons.
- bioturbation — the stirring of sediment by organisms
- bipropellant — a rocket propellant consisting of two substances, usually a fuel and an oxidizer
- bird colonel — a full colonel in the US Army
- bird of prey — A bird of prey is a bird such as an eagle or a hawk that kills and eats other birds and animals.
- bird's mouth — a right-angled notch cut in the underside of a rafter for fitting over a longitudinal member, as a wall plate.
- bird-dogging — to follow, watch carefully, or investigate.
- bird-spotter — a bird-watcher
- birth mother — the woman who gives birth to a child, regardless of whether she is the genetic mother or subsequently brings up the child
- birthday boy — the boy or man whose birthday is being celebrated
- bit of skirt — a girl or woman
- bitter aloes — a bitter purgative drug made from the leaves of several species of aloe
- bitter lemon — a non-alcoholic, fizzy drink with a lemon flavour
- bitter melon — balsam pear.
- blabbermouth — a person who talks too much or indiscreetly
- black bryony — a climbing herbaceous Eurasian plant, Tamus communis, having small greenish flowers and poisonous red berries: family Dioscoreaceae
- black copper — a regulus of 95-percent-pure copper, produced in a blast furnace by smelting oxidized copper ores.
- black forest — wooded mountain region in SW Germany
- black grouse — a large N European grouse, Lyrurus tetrix, the male of which has a bluish-black plumage and lyre-shaped tail
- black heroin — a very potent and addictive form of heroin that is dark-colored.
- black liquor — (in making wood pulp for paper) the liquor that remains after digestion.
- black poplar — a Eurasian tree, Populus nigra
- black powder — gunpowder as used in sports involving modern muzzleloading firearms
- black scoter — a scoter of Eurasia and North America, Melanitta nigra, the adult male of which is black.
- bladder worm — an encysted saclike larva of the tapeworm. The main types are cysticercus, hydatid, and coenurus
- blanket roll — a blanket or sleeping bag rolled into a cylindrical pack for easy carrying and outdoor use by hikers, soldiers, cowboys, etc., often with cooking utensils, food, and personal articles carried inside.
- blastosphere — blastula
- blaze orange — a very bright orange, as on a traffic cone.
- blennorrhoea — an excessive discharge of watery mucus, esp from the urethra or the vagina
- bletheration — nonsense!
- blind corner — a corner where the view of the road ahead is completely obscured or very restricted
- blind roller — a long ocean swell that rises almost to breaking as it passes over shoals.
- block heater — an electrically operated immersion heater fitted either to enter the water hose or the water jacket surrounding the cylinder block of a motor to warm the coolant in cold weather.
- block letter — a plain capital letter
- blood orange — a variety of orange all or part of the pulp of which is dark red when ripe