The Collaborative International Dictionary of English v.0.48:

Parenchymatous \Par`en*chym"a*tous\, Parenchymous
\Pa*ren"chy*mous\, a. [Cf. F. parenchymateux.]
   Of, pertaining to, or connected with, the parenchyma of a
   tissue or an organ; as, parenchymatous degeneration.
   [1913 Webster]