姉妹会社 しまいがいしゃ Meanings Noun affiliated company; sister company See also: 兄弟会社 (きょうだいがいしゃ). Kanji 姉 older sister. Read as シ. 妹 younger sister. Read as マイ. 会 meet. Read as カイ. 社 company. Read as シャ. Jinuma: Japanese Dictionary · Word lists