Merriam-Webster Collegiate Dictionary - permeate

 verb  (-ated; -ating)  Etymology: Latin permeatus, past participle of permeare, from per- through + meare to go, pass; akin to Middle Welsh mynet to go, Czech mijet to pass  Date: 1656  intransitive verb to diffuse through or penetrate something  transitive verb  1. to spread or diffuse through a room ~d with tobacco smoke  2. to pass through the pores or interstices of  • permeative adjective