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Webster 1913 Edition

Noun.

[See

An animal, as a sheep, dead of disease or privation; a morling.

[Eng.]

Wool plucked from a dead sheep; morling.

Noun.

Wool plucked from a dead sheep.

mortling ‎(plural mortlings)

(Britain, dialect) An animal, such as a sheep, that has died of disease or privation.
(Britain) Wool taken from a dead sheep.