diptote

American  

[dip-toht] / ˈdɪp toʊt /

noun

1. a substantive declined in only two cases, especially when occurring in a language in which this is less than the normal number.

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Etymology

Origin of diptote

1605–15; < Late Latin diptōtos noun with only two cases < Greek, equivalent to di- di- ¹ + -ptōtos, verbid of píptein to fall; compare ptōsis accidence, literally, falling