The Collaborative International Dictionary of English v.0.48:

Peripatetic \Per`i*pa*tet"ic\, a. [L. peripateticus, Gr. ?, fr.
   ? to walk about; peri` about + ? to walk: cf. F.
   p['e]ripat['e]tique.]
   1. Walking about; itinerant.
      [1913 Webster]

   2. Of or pertaining to the philosophy taught by Aristotle
      (who gave his instructions while walking in the Lyceum at
      Athens), or to his followers. "The true peripatetic
      school." --Howell.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Peripatetic \Per`i*pa*tet"ic\, n.
   1. One who walks about; a pedestrian; an itinerant. --Tatler.
      [1913 Webster]

   2. A disciple of Aristotle; an Aristotelian.
      [1913 Webster]

WordNet (r) 3.0 (2006):

peripatetic
    adj 1: of or relating to Aristotle or his philosophy;
           "Aristotelean logic" [syn: Aristotelian,
           Aristotelean, Aristotelic, peripatetic]
    2: traveling especially on foot; "peripatetic country
       preachers"; "a poor wayfaring stranger" [syn: peripatetic,
       wayfaring]
    n 1: a person who walks from place to place
    2: a follower of Aristotle or an adherent of Aristotelianism
       [syn: Aristotelian, Aristotelean, Peripatetic]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "peripatetic":
   Ahasuerus, Ancient Mariner, Argonaut, Flying Dutchman, Goliard,
   Odysseus, Oisin, Ossian, Ulysses, ambulant, ambulative, ambulator,
   ambulatory, backpacker, bird of passage, circuit-riding, drifter,
   expeditionary, floater, foot passenger, foot soldier,
   foot traveler, footslogger, gad, gadabout, globe-girdling,
   globe-trotting, go-about, going, hiker, hitchhiker, hoofer,
   infantryman, itinerant, itinerary, jaywalker, journeying,
   locomotive, marcher, mover, moving, mundivagant, nomadic, on tour,
   paddlefoot, passing, pedestrian, perambulating, perambulatory,
   peregrinative, peregrinator, peregrine, pilgrimlike, progressing,
   rambler, roamer, rolling stone, rover, roving, runabout, straggler,
   stroller, strolling, strolling player, touring, touristic,
   touristy, trailsman, tramper, traveling, trekking, troubadour,
   vagabond, vagrant, visitant, walker, walking, walkist, wanderer,
   wandering, wandering minstrel, wandering scholar, wayfaring



The Devil's Dictionary (1881-1906):

PERIPATETIC, adj.  Walking about.  Relating to the philosophy of
Aristotle, who, while expounding it, moved from place to place in
order to avoid his pupil's objections.  A needless precaution -- they
knew no more of the matter than he.