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Webster 1913 Edition
Sheepskin
Sheep′skinˊ
,Noun.
1.
The skin of a sheep; or, leather prepared from it.
2.
A diploma; – so called because usually written or printed on parchment prepared from the skin of the sheep.
[College Cant]
Webster 1828 Edition
Sheepskin
SHEE'PSKIN
,Noun.