quaternate

from WordNet (r) 3.0 (2006)

quaternate
    adj 1: consisting of or especially arranged in sets of four;
           "quaternate leaves"; "a quaternary compound" [syn:
           {quaternate}, {quaternary}]

from The Collaborative International Dictionary of English v.0.48

Quaternate \Qua*ter"nate\, a.
   Composed of, or arranged in, sets of four; quaternary; as,
   quaternate leaves.
   [1913 Webster]

[email protected]