MONOPTOTE

monoptote. Monoptote, n. a noun of only one case

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Mon″op‐tote (?), n. [[L. monoptotum, Gr. �; μόνοσ single + � apt to fall, fallen, fr. � to fall; cf. � case.]] (Gram.) 1. 1. A noun having only one case. Andrews.
2. 2. A noun having only one ending for the oblique cases.