叔母 shūmǔ

shūmǔ noun wife of father's younger brother; aunt
Domain: Modern Chinese 现代汉语 , Subdomain: Family , Concept: Relative 亲戚
Notes: 叔母 is a formal term, in contast to 婶婶, which means the same thing but is informal (Sun 2006, loc. 977).

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Truncated for common words