ar ‧ ter ‧ i ‧ o ‧ scle ‧ ro ‧ sis /ɑːˌtɪəriəʊskləˈrəʊsəs, ɑːˌtɪəriəʊsklɪˈrəʊsəs, $ ɑːrˌtɪrioʊskləˈroʊ-/ BrE AmE noun [uncountable]
a disease in which your arteries become hard, which makes it difficult for the blood to flow through
ar ‧ ter ‧ i ‧ o ‧ scle ‧ ro ‧ sis /ɑːˌtɪəriəʊskləˈrəʊsəs, ɑːˌtɪəriəʊsklɪˈrəʊsəs, $ ɑːrˌtɪrioʊskləˈroʊ-/ BrE AmE noun [uncountable]
a disease in which your arteries become hard, which makes it difficult for the blood to flow through
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012