Definify.com
Webster 1913 Edition
Southdown
South′downˊ
,Adj.
Of or pertaining to the South Downs, a range of pasture hills south of the Thames, in England.
Southdown sheep
(Zool.)
, a celebrated breed of shortwooled, hornless sheep, highly valued on account of the delicacy of their flesh. So called from the South Downs where the breed originated.
South′downˊ
,Noun.
A Southdown sheep.