Green’s Dictionary of Slang

planter’s medicine n.

[administered every Monday to slaves who complained of ulcers and went to the plantation hospital. The punishment was meted out until the ulcers healed]

(W.I.) a flogging.

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B. M’Mahon Jam. Plantership 192: All persons in the hospital afflicted with ulcers [...] were flogged every Monday morning until the ulcers got better [...] discipline of this kind was customary on every estate [...] I defy any planter to deny it:– it was called planter’s medicine .