Green’s Dictionary of Slang

a type of false die, in which one side is fractionally longer than the rest.

1552		G. Walker Detection of Vyle and Detestable Use of Dice Play 23: ‘Lo, here,’ saith the cheater to this young novice, ‘a well-favoured die, that seemeth good and square; yet is the forehead longer on the cater and tray than any other way, and therefore holdeth the name of a langret.’.
1591		Greene Notable Discovery of Coosnage in Grosart (1881–3) X 12: The Chetor, with a langret, cut contrarie to the vantage, will cros-bite a Card cater tray.
1608		Dekker Belman of London E3: A Langret is a Dye, which simple men haue seldome heard of, and happily neuer seene (but to their cost) It is (to the eye of him that is but a Nouice) a Good and Square Die, yet it is cut longer vpon the Cater and Trea, then vpon any other point.
1612		Art of Juggling C4: A langret [...] is a well-favoured die and seemeth good and square, yet it is forged longer upon the cater and trea than any other way, and therefore it is called a langret .
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: The names of false dice: A bale of bard cinque deuces A bale of flat cinque deuces A bale of flat sice aces A bale of bard cater traes A bale of flat cater traes A bale of fulhams A bale of light graniers A bale of langrets contrary to the ventage A bale of gordes, with as many highmen as lowmen, for passage A bale of demies A bale of long dice for even and odd A bale of bristles A bale of direct contraries.
1801		‘Modern Dict.’ in Sporting Mag. May XVIII 100/1: [as cit. 1785].
1811		Lex. Balatronicum.