Yes, fibrins is a Scrabble word!

...and is worth 12 points in Scrabble, and 14 points in Words with Friends

fibrins

Noun

1. A white insoluble fibrous protein formed by the action of thrombin on fibrinogen when blood clots; it forms a network that traps red cells and platelets

What Scrabble words can I make with the letters in fibrins?

6 Letter Words

fibrin

5 Letter Words

brins
finis
firns

4 Letter Words

bins
brin
bris
fibs
fins
firn
firs
ibis
iris
nibs
nisi
ribs
rifs
rins
snib

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Words that can be created with an extra letter added to fibrins:

O:fibroins