BRACKISH Meaning of BRACKISH in English brack ‧ ish /ˈbrækɪʃ/ BrE AmE adjective [ Date: 1500-1600 ; Language: Dutch ; Origin: brac 'salty' ] brackish water is not pure because it is slightly salty Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012