pent-

from The Collaborative International Dictionary of English v.0.48

Pen \Pen\, v. t. [imp. & p. p. {Penned}or {Pent} (?); p. pr. &
   vb. n. {Penning}.] [OE. pennen, AS. pennan in on-pennan to
   unfasten, prob. from the same source as pin, and orig.
   meaning, to fasten with a peg.See {Pin}, n. & v.]
   To shut up, as in a pen or cage; to confine in a small
   inclosure or narrow space; to coop up, or shut in; to
   inclose. "Away with her, and pen her up." --Shak.
   [1913 Webster]

         Watching where shepherds pen their flocks at eve.
                                                  --Milton.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Pent \Pent\ (p[e^]nt), p. p. or a. [From {Pen}, v. t.]
   Penned or shut up; confined; -- often with up.
   [1913 Webster]

         Here in the body pent.                   --J.
                                                  Montgomery.
   [1913 Webster]

         No pent-up Utica contracts your powers.  --J. M.
                                                  Sewall.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

pent- \pent-\ (p[e^]nt), pref.
   Same as {penta-}; -- used as a combining form before vowels,
   as in pentoxide.
   [PJC]