millipore

noun

Etymology: From milli- + pore, originally a trademark.

1. Any of several filters, made from cellulose acetate membranes, capable of removing very small particles.

   “Because of its use in cloud seeding it is important to know whether millipores can detect silver iodide.”

   “Calcium ions are present in this fluid. The millipores within the enamel contain this electrolyte , separated by the positive and negative poles; the cathode is the outer enamel, and the anode is the internal enamel.”