The Collaborative International Dictionary of English v.0.48:

Maclurin \Ma*clu"rin\, n. (Chem.)
   See Morintannic.
   [1913 Webster] macon

The Collaborative International Dictionary of English v.0.48:

Morintannic \Mo`rin*tan"nic\, a. [NL. Morus fustic + E. tannic.]
   (Chem.)
   Pertaining to, or designating, a variety of tannic acid
   extracted from fustic (Chlorophora tinctoria, formerly
   Maclura tinctoria and Morus tinctoria) as a yellow
   crystalline substance; -- called also maclurin.
   [1913 Webster]