The word antheridial is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 16
Highest Scoring Words With Friends™ Play In The Letters antheridial
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Seven Letter Word Alert: (34 words)
adrenal, airdate, airhead, airline, anilide, deliria, denarii, detrain, dilater, enthral, hairnet, handier, handler, hernial, inditer, inertia, inhaled, inhaler, inherit, latrine, lintier, nitride, radiant, radiate, rainhat, ratline, reliant, retinal, tendril, tiaraed, tradein, trailed, trained, trenail