Definition of "quillet"

There’s another : why might not that bee the Scull of a Lawyer ? where be his Quiddits now ? his Quillets ? his Caſes ? his Tenures, and his Tricks ? why doe’s he ſuffer this rude knaue now to knocke him about the Sconce with a dirty Shouell, and will not tell him of his Action of Battery ? hum.

c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene i], page 277, column 2

Hence it comes that such a pack of vile buffoons [...] intrude with unwashed feet upon the sacred precinct of Theology, bringing with them nothing save brazen impudence, and some hackneyed quillets and scholastic trifles not good enough for a crowd at a street corner.

1624, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps

The single and only [Royal Wilding apple] tree from which the apple was first propagated is very tall, fair, and stout ; I believe it stands about twenty feet high. It stands in a very little quillet (as we call it) of gardening, adjoining to the post-road that leads from Exeter to Oakhampton, in the parish of St. Thomas, but near the borders of another parish called Whitestone.

1908, Sabine Baring-Gould, “Hugh Stafford and the Royal Wilding”, in Devonshire Characters and Strange Events, London: John Lane, page 7