diptote
[dip-toht]
noun
a substantive declined in only two cases, especially when occurring in a language in which this is less than the normal number.
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
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019