† Welsh layn.Obsoleterare a roofing slate measuring three by two feet (approx. 61 by 91 cm).Apparently only attested in dictionaries or glossaries.
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society > occupation and work > materials > raw material > stone or rock > [noun] > building stone > stone of the nature of slate > for roofing > types of
skaillie1496
Stonesfield slate1855
Welsh lay1891
Collyweston1949
1891 Cent. Dict. at Lay1 (note) 8Welsh lay, a slate measuring 3 by 2 feet.