Definition of monogamian in English:
monogamian
adjective ˌmɒnə(ʊ)ˈɡamɪənˌmɒnə(ʊ)ˈɡeɪmɪən
Of or relating to monogamy; practising monogamy, monogamous. rare.
Origin
Late 19th century; earliest use found in Lewis Henry Morgan (1818–1881). From monogamy + -an; compare -ian.