PROTHROMBINS

Yes, PROTHROMBINS is a Scrabble word!

Letter values in Scrabble US: P 3, R 1, O 1, T 1, H 4, R 1, O 1, M 3, B 3, I 1, N 1, S 1.P 3 · R 1 · O 1 · T 1 · H 4 · R 1 · O 1 · M 3 · B 3 · I 1 · N 1 · S 1

Is it a valid word?

• Scrabble US: valid, 21 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 21 points
• Scrabble UK: valid, 21 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 21 points
• Words with Friends: valid, 24 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 24 points