birthdayn.
英 'bɜːθdeɪ | 美 'bɝθde
中文n. 生日，诞辰；诞生的日子
词根词源
birthday (n.)late 14c., from Old English byrddæg, "anniversary celebration of someone\\'s birth" (at first usually a king or saint); see birth (n.) + day. Meaning "day on which one is born" is from 1570s. Birthnight is attested from 1620s.
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