koo-má姑媽

paternal grandaunt

paternal grandaunt (paternal grandfather's sister)

English Wiktionary, “姑媽” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E5%A7%91%E5%AA%BD · confidence: High (Wiktionary, PH/Quanzhou/Jinjiang)