The word mesenteric 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™ Play In The Letters mesenteric
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Seven Letter Word Alert: (31 words)
cements, centers, centres, cistern, cretins, eeriest, emetics, enemies, enteric, enticer, entices, entrees, entries, meeters, mercies, metrics, metrise, mincers, minters, recites, reemits, remeets, remines, remints, retimes, scenter, secrete, sincere, teemers, teenier, trienes