Webster's Revised Unabridged Dictionary · 1913

Tridecatoic

Tridecatoic (tri`dek*ȧ*tō"ik) , adjective

[Prefix tri- + Greek de`katos tenth.]

(Chemistry) Of, pertaining to, or designating, that acid of the fatty acids heterologous with tridecane. It is a white crystalline substance.