per·i·proct 
(pĕrə-prŏkt′)
(pĕrə-prŏkt′)n.
The flexible membrane around the anus of certain invertebrates, especially echinoids.
[PERI- + Greek prōktos, anus.]
- linebacker
- linebacking
- line breeding
- linecaster
- linecasting
- line cut
- line dance
- line dancer
- line drawing
- line drive
- line engraving
- Line Islands
- line item
- line-item veto
- lineman
- linen
- line of credit
- line officer
- line of force
- line of scrimmage
- line of sight
- lineolate
- line (one's) pockets
- line one's pockets
- line-out