The word ectrodactyly 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: 24
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (29 words)
accoyed, acolyte, cacodyl, cacolet, caroled, cattery, clatter, clotted, clotter, coacted, codetta, cordate, cotylae, cotylar, cyclery, dactyly, delator, detract, leotard, located, lottery, lyrated, oracled, rattled, retotal, rotated, royalty, totaled, treacly