Merriam-Webster's Collegiate® Dictionary, 11th Edition
SEEP
I. intransitive verb
Etymology: alteration of earlier sipe, from Middle English sipen, from Old English sipian; akin to Middle Low German sipen to seep
Date: 1790
to flow or pass slowly through fine pores or small openings ; ooze ,
2. to enter or penetrate slowly , to become diffused or spread ,
II. noun
Date: 1824
1. a spot where a fluid (as water, oil, or gas) contained in the ground oozes slowly to the surface and often forms a pool, a small spring, seepage , seepy adjective