cy ‧ a ‧ nide /ˈsaɪənaɪd/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Origin: cyanogen type of poisonous gas (19-21 centuries) , from French cyanogène , from Greek kyanos ( ⇨ ↑ cyan ) ]
a very strong poison
cy ‧ a ‧ nide /ˈsaɪənaɪd/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Origin: cyanogen type of poisonous gas (19-21 centuries) , from French cyanogène , from Greek kyanos ( ⇨ ↑ cyan ) ]
a very strong poison
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012