(1):

(v.) A minute opening or passageway; an interstice between the constituent particles or molecules of a body; as, the pores of stones.

(2):

(v.) One of the minute orifices in an animal or vegetable membrane, for transpiration, absorption, etc.

(3):

(v. i.) To look or gaze steadily in reading or studying; to fix the attention; to be absorbed; - often with on or upon, and now usually with over.