The word macrocytosis 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: 23
Highest Scoring Words With Friends™ Plays In The Letters macrocytosis
:
Seven Letter Word Alert: (33 words)
accosts, arctics, atomics, castors, coactor, coarcts, cocoyam, costars, cystoma, cytomas, cytosis, mascots, miscast, missort, mosaics, mycosis, mycotic, myotics, mystics, oocysts, oocytic, osmotic, racisms, racists, scoriac, scorias, scotoma, sitcoms, somatic, stroams, trisomy, tsarism, tyromas