concretive

From concrete +‎ -ive?

concretive (comparative more concretive, superlative most concretive)

1. Promoting concretion.
   • 1646, Sir Thomas Browne, Vulgar Errors:

     We do not easily ascribe their induration to cold; but rather unto salinous spirits and concretive juices.

• “concretive”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.