The word micrometeoritic 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: 27
Highest Scoring Words With Friends™ Play In The Letters micrometeoritic
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Seven Letter Word Alert: (23 words)
coercer, cometic, correct, coterie, critter, emitter, erector, icteric, meiotic, memetic, memoire, mimetic, miterer, mitotic, omitter, reciter, remoter, retimer, roomier, termite, titmice, trimmer, trireme