ῥέα

Adv.
A. easily, lightly, Il. 5.304, 8.179, etc.; cf. ῥεῖα, ῥᾶ. [ or -, ll. cc.; but as one long syll. in 12.381, 13.144, Hes. Op. 5.]
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project