from
The Collaborative International Dictionary of English v.0.48
Trigenic \Tri*gen"ic\, a. [Pref. tri- + gen- + -ic. So named in
reference to its composition, it being supposed to contain
the radicals of three molecules of cyanic acid.] (Chem.)
Of, pertaining to, or designating, an acid, {C4H7N3O2},
obtained, by the action of the vapor of cyanic acid on cold
aldehyde, as a white crystalline substance having a slightly
acid taste and faint smell; -- called also {ethidene-biuret}
or {ethylidene-biuret}.
[1913 Webster]