MESOTHORAX

Yes, MESOTHORAX is a Scrabble word!

Letter values in Scrabble US: M 3, E 1, S 1, O 1, T 1, H 4, O 1, R 1, A 1, X 8.M 3 · E 1 · S 1 · O 1 · T 1 · H 4 · O 1 · R 1 · A 1 · X 8

Is it a valid word?

• Scrabble US: valid, 22 points.Scrabble USYour dictionary · Change (go to the dictionary switch)Valid · 22 points
• Scrabble UK: valid, 22 points. Make Scrabble UK your dictionary.Scrabble UKYour dictionary · ChangeValid · 22 points
• Words with Friends: valid, 22 points. Make Words with Friends your dictionary.Words with FriendsYour dictionary · ChangeValid · 22 points