'Massiest' definitions:

Definition of 'Massiest'

From: GCIDE

Massy \Mass"y\, a. [Compar. Massier; superl. Massiest.] Compacted into, or consisting of, a mass; having bulk and weight or substance; ponderous; bulky and heavy; weighty; heavy; as, a massy shield; a massy rock. [1913 Webster]
Your swords are now too massy for your strengths, And will not be uplifted. --Shak. [1913 Webster]
Yawning rocks in massy fragments fly. --Pope. [1913 Webster]