noun, noun which may take the genitive case particle 'no'
maternal line; mother's side of the family
Refers to lineage or relatives on the mother's side. Often used in genealogical or anthropological contexts. The antonym is 父系 (paternal line).
See also: 父系
彼は母系の家系を調べている。
He is researching his maternal lineage.
母系の親戚が北海道に住んでいる。
Relatives on my mother's side live in Hokkaido.