The word intradermal 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: 17
Highest Scoring Words With Friends™ Plays In The Letters intradermal
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Seven Letter Word Alert: (54 words)
admiral, admirer, adrenal, ailment, airdate, alarmed, aliment, amentia, animate, detrain, dilater, drainer, laminae, laminar, lardier, latrine, leadman, maltier, mandate, mandrel, mandril, manlier, mantled, mariner, marital, marlite, married, martial, martian, minaret, mineral, narrate, netmail, radiant, radiate, raiment, randier, ratline, readmit, reliant, retinal, retrain, retrial, tardier, tarried, tendril, terrain, tiaraed, tradein, trailed, trailer, trained, trainer, trenail