trigenic

from The Century Dictionary.

• Noting an acid, a colorless compound, prepared by the action of cyanic acid on aldehyde. It crystallizes in small prisms and decomposes when heated. Also called ethylidenebiuret.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (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.