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teal

In parts of Wales, a unit of dry capacity, varying by location, often = 5 Winchester bushels, but also 3, 6 and even 8. See the sources. Five Winchester bushels is about 176.2 liters. Also called a telaid or têl.

sources

The teal (telaid) is a measure peculiar to the three western, or Dimetian counties: at Llandovery the subdivisions are as follow:

2½ quarts,	1 quarter bach.
4 quarters,	1 meiliaid.
4 Meiliaid,	1 bushel, same as the Brecon, &c.
4 bushels,	1 teal, 40 gallons, or 5 Winch. bushels.

At Llan Bedr (Lampeter) 20 quarts, 1 peck; 2 pecks, 1 quarter; and 4 quarters, 1 teal, as above, of 5 Winchester bushels, the same as the stacca of Neath, &c.: in others it is double that quantity, or 6 Winchesters; and distinguished by the terms Têl maur, and Têl bach.

Walter Davies.
General View of the Agriculture and Domestic Economy of South Wales… Volume II.
London: Printed by B. McMillan, Bow-Street, Covent Garden: For Sherwood, Neely & Jones, Paternoster-Row; Tudor and Heath, Monmouth; etc., 1815.
Page 501.

Cardiganshire: in some parts 3 W. b. in others 6, called têl mawr and têl bach.

Brecknockshire and Caermarthenshire: of lime, in some parts, 4 bushels of 10 gallons each = 5 W. b. equal to the Irish barrel used for coals and salt.

Pembrokeshire: 4 or 5 bushels, called a barrel; a long teal contains 8 w. bushels.

Second Report, (1820) page 35.