different between mortling vs mottling

English

From mort +? -ling. Compare morkin.

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.

mottling

mottling (plural mottlings)

spots or blotches of different shades or colours
- 1910, The Year Book of Dermatology (page 124)
  The skin was somewhat pigmented, especially in certain regions, while over the whole there appeared whitish, rounded or oval mottlings or dapplings, most obvious where the surrounding cuticle was most deeply colored.

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