P₃E₁R₁I₁O₁S₁T₁R₁A₁C₃U₁M₃S₁

19 points

PERIOSTRACUMS is no goodvalid

Not a playable Scrabble word in NWL2023.

It is valid in CSW24·

PERIOSTRACUM, the horny outer layer of a mollusc's shell [n]

177,066 of 280,887 in CSW24·not in NWL2023