o ‧ pal /ˈəʊp ə l $ ˈoʊ-/ BrE AmE noun [uncountable and countable]
[ Date: 1500-1600 ; Language: Latin ; Origin: opalus , from Sanskrit upala 'stone, jewel' ]
a type of white stone with changing colours in it, often used in jewellery
o ‧ pal /ˈəʊp ə l $ ˈoʊ-/ BrE AmE noun [uncountable and countable]
[ Date: 1500-1600 ; Language: Latin ; Origin: opalus , from Sanskrit upala 'stone, jewel' ]
a type of white stone with changing colours in it, often used in jewellery
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012