ETYMOLOGY
from Latin plus, plur- (more) + animous;
after unanimous (from Latin unanimis, unanimus [from unus (one) + animus (mind)] + -ous)
EXAMPLE
“… Should I make a parallel of this present Basis with the former, & were I sure my Mare would not stumble, I could demonstrate it to be Heterogeneous, Heterodoxous, Incongrous, Omnigenous, Pluranimous, Versipellous, Centireligious, Nummiamorous; I thought I should hit it at length, but I take in Army and all, or else my Mare would soone stand on her head. …”
From: Discolliminium, or, A most obedient reply to a late book, called, Bounds & bonds, so farre as concerns the first demurrer and no further
By B. (Nathaniel Ward), 1650
Lexicophilia 