por-

poro-

, por-
1. A pore, a duct, an opening.
2. A going through, a passing through.
3. A callus; an induration.

por-, poro-

prefix meaning "a cavity, opening, passage or pore": porencephalia, porion, porotomy.
References in classic literature ?
He was known to us all as being a most cruel wretch,--a common drunk- ard, who had, by his reckless mismanagement and profligate dissipation, already wasted a large por- tion of his father's property.
He endeavored to summon up the por- traits which he had seen in his volume, and to place them, like living figures, in the empty seat.