endogamous

from WordNet (r) 3.0 (2006)

endogamous
    adj 1: characterized by or fit for fertilization by pollen from
           another flower of the same kind [syn: {endogamous},
           {endogamic}] [ant: {autogamic}, {autogamous}, {exogamic},
           {exogamous}]
    2: pertaining to or characterized by the custom of marrying only
       within the limits of a clan or tribe [syn: {endogamous},
       {endogamic}] [ant: {exogamic}, {exogamous}]

from The Collaborative International Dictionary of English v.0.48

Endogamous \En*dog"a*mous\, a. [Endo- + Gr. ? marriage.]
   Marrying within the same tribe; -- opposed to {exogamous}.
   [1913 Webster]