Green’s Dictionary of Slang

1. the vagina.

1595		Shakespeare Romeo and Juliet II i: Now he will sit under a medlar-tree, And wish his mistress were that kind of fruit As maids call medlars when they laugh alone [...] O that she were An open-arse and thou a poperin pear!
1608		Dekker Honest Whore Pt 2 (1630) I i: Women are like medlars (no sooner ripe but rotten].
1611		Davies of Hereford Scourge of Folly 10: I muse her stomacke now so much should faile, To loath a Medlar, being an Open-taile.
1653		Loves of Hero and Leander 8: On Medlar branch the Maid doth sit, / One Medlar with a meany mit; / Though she was there, there was to see, / Nothing but Medlars on the tree. [marginal note - A Medlar by the Philosphers, is thought to be an Open-Arse.].
1653		Loves of Hero and Leander 8: He saw a Medlar ‘twixt her leggs: / I know not how they there did settle, / But in the Weaver got his Shettle: / Where we will leave Tom-trumpery, / To talk of other company.
1663		Jack Adams his perpetual almanack (2 edn) 33: Plenty of good things, even to open Arses and Medlars.
1890–1904		Farmer & Henley Sl. and Its Analogues.
c.1904		A. Crowley Snowdrops from a Curate’s Garden 25: Dick’s best leg of three vibrated. Clara’s medlar got a fair share of fun out of his knuckles.

2. a promiscuous woman.

1603		Shakespeare Measure for Measure IV iii: Else they would have married me to that rotten medlar.
1659		Greene & Lodge Lady Alimony II ii: The next her in rank, and as right as my leg in her career, is Madam Medler, a cunning Civil Trader.
1705		London-Bawd (3rd edn) Ch. i: She’s the most like a Medlar of any thing, for she’s never ripe till she’s rotten.

3. (UK Und.) a man who smells.

1859

Matsell Vocabulum.