プログレッシブ和英中辞典(第4版)の解説
るいえん【類縁】
〔親類〕a relative, a relation；〔密接な関係〕a close relation；〔類似性〕affinity
類縁関係
a close relation [connection]
この二派の間には深い類縁関係がある
These two schools are closely connected with each other.／There is a close relationship between these two sects.
類縁体
an analog