Definition of "dimity"

Strain the ſoup through a piece of dimity into a clean ſaucepan, and let it ſtew till it is of the thickneſs of cream.

1717, T. Williams, The Accomplished Housekeeper, and Universal Cook‎, page 134

The first of these tweels, in respect to the number of leaves, is the dimity cord, which is merely the three leafed tweel turned, a plan of which is subjoined, both for cording and treading.

1831, John Murphy, A Treatise on the Art of Weaving, Glasgow, page 42

The drapery should always be perfectly white, of dimity, twilled muslin, or other neat strong material.

1840, "A Lady", The Workwoman's Guide‎, page 42

Period slipcovers were typically made of linen and cotton, in woven checks or striped dimities.

2009 Fall, Rabbit Goody, Jill Mancy, Interiors: Bug Bars & Slipcovers, Early Homes, page 20

The twilight fell mistily—it was the first of the autumn mists—and in the dimity the undispersed families of the tawny owl called to each other, the young with keewick and the old with the proper hooroo, hooroo.

1958, T[erence] H[anbury] White, chapter XI, in The Once and Future King, New York, N.Y.: G. P. Putnam's Sons, book I (The Sword in the Stone)