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There are 4 ten-letter words beginning with BIOR

BIOREACTOR	• bioreactor n. (Biochemistry) A fermentation vat, containing microorganisms or biochemically active substances, used… • BIOREACTOR n. a device or apparatus in which living organisms, such as bacteria, synthesise useful substances or break down waste.
BIOREAGENT	• bioreagent n. (Biochemistry) Any reagent (especially an enzyme) of biological origin. • bioreagent n. (Biochemistry) Any reagent used in biochemistry. • BIOREAGENT n. a biological agent that reacts.
BIOREGIONS	• bioregions n. Plural of bioregion. • BIOREGION n. an area in which climate and environment are consistent.
BIORHYTHMS	• biorhythms n. Plural of biorhythm. • BIORHYTHM n. a periodic change in the behaviour or physiology of many animals and plants (e.g. hibernation and migration) mediated by hormones which are in turn influenced by changes in day-length.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 13 words
Scrabble in French: 1 word
Scrabble in Spanish: 1 word
Scrabble in Italian: 3 words
Scrabble in German: no word
Scrabble in Romanian: 1 word

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