The Collaborative International Dictionary of English v.0.48:

Leucic \Leu"cic\ (l[=u]"s[i^]k), Leucinic \Leu*cin"ic\
   (l[-u]*s[i^]n"[i^]k), a. (Chem.)
   Pertaining to, or designating, an acid obtained from leucin,
   and called also oxycaproic acid.
   [1913 Webster] Leucine