matrilineal emperor of Japan; emperor with imperial mother and non-imperial father
Refers to an emperor (male or female) whose mother belongs to the Imperial family but whose father does not. Contrasts with 女性天皇 (female emperor), which simply means a female emperor regardless of lineage.
See also: 女性天皇
The possibility of a matrilineal emperor was discussed in the Diet.
A matrilineal emperor refers to an emperor whose father is not a member of the Imperial family.
女性天皇 means a female emperor, regardless of lineage. 女系天皇 specifically refers to an emperor whose mother is from the Imperial family but whose father is not, and can be male or female.
Compound of 女系 (matrilineal) and 天皇 (emperor). The term is used in discussions about imperial succession.