sheep·skin 
/ˈʃi:pˌskɪn/ noun
plural sheep·skins /ˈʃi:pˌskɪn/ noun 1 [count, noncount] a : the skin of a sheep usually with the wool still on it
b : a type of leather made from the skin of a sheep
▪ a bag/coat made of sheepskin 2 [count] US, informal + humorous : a diploma from a college or university
▪ jobs that don't require a sheepskin
b : a type of leather made from the skin of a sheep
▪ a bag/coat made of sheepskin
▪ jobs that don't require a sheepskin
