HERBICIDE Meaning of HERBICIDE in English herb ‧ i ‧ cide /ˈhɜːbəsaɪd, ˈhɜːbɪsaɪd $ ˈhɜːr-,ˈɜːr-/ BrE AmE noun [uncountable and countable] technical a substance used to kill unwanted plants Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012