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There are 8 twelve-letter words beginning with FIBRI

FIBRILLATING	• fibrillating v. Present participle of fibrillate. • fibrillating adj. Splitting into fibrils or fibres. • fibrillating adj. Of a muscle, especially in the heart: undergoing fibrillation; quivering.
FIBRILLATION	• fibrillation n. The rapid, irregular, and unsynchronized contraction of the muscle fibers of the heart. • FIBRILLATION n. uncoordinated contraction of muscle-fibres in the heart.
FIBRILLIFORM	• FIBRILLIFORM adj. in the form of fibrils.
FIBRINOGENIC	• fibrinogenic adj. (Biochemistry) That produces fibrin. • FIBRINOGENIC adj. of or like a fibrinogen, also FIBRINOGENOUS.
FIBRINOLYSES	• fibrinolyses n. Plural of fibrinolysis. • FIBRINOLYSIS n. the usually enzymatic breakdown of fibrin.
FIBRINOLYSIN	• fibrinolysin n. (Biochemistry) An enzyme derived from plasma of bovine origin, or extracted from cultures of certain… • FIBRINOLYSIN n. any of several proteolytic enzymes that promote the dissolution of blood clots.
FIBRINOLYSIS	• fibrinolysis n. The process wherein a fibrin clot, the product of coagulation, is broken down. • FIBRINOLYSIS n. the usually enzymatic breakdown of fibrin.
FIBRINOLYTIC	• fibrinolytic adj. Of, pertaining to, or producing fibrinolysis. • fibrinolytic n. A substance or drug that produces fibrinolysis. • FIBRINOLYTIC adj. relating to fibrinolysis.

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: 16 words
Scrabble in French: 4 words
Scrabble in Spanish: 7 words
Scrabble in Italian: 6 words
Scrabble in German: no word
Scrabble in Romanian: 5 words

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