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ao dai(ou′ dī, ô′)
n. pl. ao dais
A long-sleeved, usually full-length garment with sides slit up to the hips, traditionally worn by Vietnamese women over loose trousers.
[Vietnamese áo dài : áo, tunic (from Middle Chinese ʔaw´, padded coat; also the source of Mandarin ǎo) + dài, long.]