Prehnitic

1. a. Pertaining to, or designating, a tetrabasic acid of benzene obtained as a white crystalline substance; — probably so called from the resemblance of the wartlike crystals to the mammillae on the surface of prehnite.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.