hereditism n.

1530s, "inheritance, succession," from French hérédité, from Old French eredite "inheritance, legacy" (12c.), from Latin hereditatem (nominative hereditas) "heirship, inheritance, an inheritance, condition of being an heir," from heres (genitive heredis) "heir, heiress" (from PIE root *ghe- "to be empty, left behind," source also of Greek khēra "widow"). Legal sense of "inheritable quality or character" first recorded 1784; the modern biological sense "transmission of qualities from parents to offspring" seems to be found first in 1863, introduced by Herbert Spencer.

word-forming element making nouns implying a practice, system, doctrine, etc., from French -isme or directly from Latin -isma, -ismus (source also of Italian, Spanish -ismo, Dutch, German -ismus), from Greek -ismos, noun ending signifying the practice or teaching of a thing, from the stem of verbs in -izein, a verb-forming element denoting the doing of the noun or adjective to which it is attached. For distinction of use, see -ity. The related Greek suffix -isma(t)- affects some forms.