The Collaborative International Dictionary of English v.0.48:

Mendicant \Men"di*cant\, a. [L. mendicans, -antis, p. pr. of
   mendicare to beg, fr. mendicus beggar, indigent.]
   Practicing beggary; begging; living on alms; as, mendicant
   friars.
   [1913 Webster]

   Mendicant orders (R. C. Ch.), certain monastic orders which
      are forbidden to acquire landed property and are required
      to be supported by alms, esp. the Franciscans, the
      Dominicans, the Carmelites, and the Augustinians.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mendicant \Men"di*cant\, n.
   A beggar; esp., one who makes a business of begging;
   specifically, a begging friar.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mendicant
    adj 1: practicing beggary; "mendicant friars"
    n 1: a male member of a religious order that originally relied
         solely on alms [syn: friar, mendicant]
    2: a pauper who lives by begging [syn: beggar, mendicant]

Moby Thesaurus II by Grady Ward, 1.0:

110 Moby Thesaurus words for "mendicant":
   Albigensian, Catharist, Franciscan, Sabbatarian, Trappist,
   Waldensian, abbacomes, abbot, abstainer, abstinent, anchorite,
   anchoritic, ascetic, austere, beadsman, beggar, beggared, beggarly,
   begging, bereaved, bereft, bhikshu, brother, bum, bummer, cadger,
   cadging, caloyer, celibate, cenobite, conventual, conventual prior,
   coupon clippers, deprived, dervish, disadvantaged, drone, eremitic,
   fakir, flagellant, fleeced, freeloader, friar, ghettoized,
   grand prior, hermit, hieromonach, hobo, idle rich, impoverished,
   in need, in rags, in want, indigent, lay abbot, lay brother,
   leisure class, loafer, lounge lizard, lumpen proletariat,
   mendicant friar, mendicant order, monastic, monk, moocher,
   mooching, necessitous, needy, nonworker, on relief, out at elbows,
   palmer, panhandler, parasite, pauperized, petitionary, pilgrim,
   pillar saint, pillarist, poverty-stricken, prayerful, precative,
   prior, puritan, puritanical, religieux, religious, rentiers,
   rigoristic, sannyasi, schnorrer, scrounger, scrounging,
   self-denying, spiv, sponger, starveling, stripped, stylite,
   suppliant, supplicant, supplicating, supplicatory,
   the unemployable, the unemployed, tramp, underprivileged,
   wedded to poverty, yogi, yogin