hapax legomenon

noun
🔊/ˌhæpæks ləˈɡɒmənɒn/
🔊/ˌhæpæks ləˈɡɑːmənɑːn/
(plural hapax legomena
🔊/ˌhæpæks ləˈɡɒmənə/
🔊/ˌhæpæks ləˈɡɑːmənə/
)
(linguistics语言学)
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  1. a word or phrase that is recorded as having been used only once只用过一次的词句;罕用语
    Word Originmid 17th cent.: Greek, ‘a thing said once’, from hapax ‘once’ and the passive participle of legein ‘to say’.