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Webster 1913 Edition

Adj.

[overturning, fr. [GREEK] to turn up or over; [GREEK] + [GREEK] too turn.]

Overthrowing; defeating; – applied to Plato’s refutative dialogues.

Enfield.

Adj.

[Gr. to overturn.]

Overthrowing; defeating; prostrating; a word applied to the dialogues of Plato, which represent a complete defeat in the gymnastic exercises.

anatreptic ‎(not comparable)

rebutting; overthrowing; defeating; applied to Plato's refutative dialogues.
(Can we find and add a quotation of Enfield to this entry?)

rebutting; refuting