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Webster 1913 Edition

Adj.

[L.

castigatorius

Punitive in order to amendment; corrective.

Noun.

An instrument formerly used to punish and correct arrant scolds; – called also a

ducking stool

, or

trebucket

Blacktone.

Adj.

Tending to correction; corrective; punitive.

Noun.

An engine formerly used to punish and correct arrant scolds, called also a ducking stool, or trebucket.

castigatory ‎(comparative more castigatory, superlative most castigatory)

castigatory ‎(plural castigatories)

(obsolete) An instrument formerly used to punish and correct arrant scolds; the ducking stool or trebucket.
(Can we find and add a quotation of Blackstone to this entry?)