hy ‧ dra /ˈhaɪdrə/ BrE AmE noun
1 . Hydra a snake in ancient Greek stories with many heads that grow again when they are cut off
2 . [countable] formal a problem that is very difficult to get rid of because it keeps returning
hy ‧ dra /ˈhaɪdrə/ BrE AmE noun
1 . Hydra a snake in ancient Greek stories with many heads that grow again when they are cut off
2 . [countable] formal a problem that is very difficult to get rid of because it keeps returning
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012