Definition of "medicinable"

hee by his lawes, inhibiteth […] the perswasion, that any evill may come unto man from the Gods, except for his greater good, and for a medicinable [translating medecinal] effect, whensoever he falleth into it.

1603, Michel de Montaigne, chapter 12, in John Florio, transl., The Essayes […], book II, London: […] Val[entine] Simmes for Edward Blount […]

I pray you in your Letters, / When you ſhall theſe vnluckie deeds relate, / Speake of me, as I am. […] / Of one, whoſe ſubdu'd Eyes, / Albeit un-vsed to the melting moode, / Drops teares as faſt as the Arabian Trees / Their Medicinable gumme.

1603, William Shakespeare, “The Tragedie of Othello, the Moore of Venice”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies, London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, act V, scene ii, page 338

[…] this Water is every way as Medicinable as the other; serving well in all Decoctions and Syrups, though it be not altogether so pleasing to the smell.

1677, Hannah Woolley, The Compleat Servant-Maid‎, London: T. Passinger, page 42