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mascull

mascull, a. Obs.
  Also 5 maskyll.
  [Of obscure origin: ? identical with mascle a.]
  tun mascull: some variety of the tun (liquid measure).

1432 Rolls Parlt. IV. 405/2 [‘The wynes of Gascoigne and Guyen’ had only 4 or 5 inches of lees] in a tonne maskyll. 1531 in Sel. Pleas Admiralty (Selden Soc.) I. 36 Accounting always a ton mascull for a ton, ij pipes for a ton, [etc.].

Oxford English Dictionary

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