(inorganic chemistry) A polymeric organomercury compound, (7,11-dimercurio-1,5,9-trioxa-2,4,6,8,10,12-hexamercuracyclododec-3-yl)mercury;trihydrate, that functions as a catalyst in ethoxylation rea...

plural of leafsheath

A renewable energy source.

(rail transport) confined to running on rails.