bittern.[See Bitts.] (Naut.) AA turn of the cable which is round the bitts.()Bitter end, that part of a cable which is abaft the bitts, and so within board, when the ship rides at anchor.()a.[AS. biter; akin to Goth. baitrs, Icel. bitr, Dan., Sw., D., & G. bitter, OS. bittar, fr. root of E. bite. See Bite, v. t.]1. Having a peculiar, acrid, biting taste, like that of wormwood or an infusion of hops; as, a bitter medicine; bitter as aloes.()2. Causing pain or smart; piercing; painful; sharp; severe; as, a bitter cold day.()3. Causing, or fitted to cause, pain or distress to the mind; calamitous; poignant.()It is an evil thing and bitter, that thou hast forsaken the Lord thy God. (Jer. ii. 19.)4. Characterized by sharpness, severity, or cruelty; harsh; stern; virulent; as, bitter reproach.()Husbands, love your wives, and be not bitter against them. (Col. iii. 19.)5. Mournful; sad; distressing; painful; pitiable.()The Egyptians . . . made their lives bitter with hard bondage. (Ex. i. 14.)Bitter apple, Bitter cucumber, Bitter gourd. (Bot.) See Colocynth. -- Bitter cress (Bot.), a plant of the genus Cardamine, esp. Cardamine amara. -- Bitter earth (Min.), tale earth; calcined magnesia. -- Bitter principles (Chem.), a class of substances, extracted from vegetable products, having strong bitter taste but with no sharply defined chemical characteristics. -- Bitter salt, Epsom salts; magnesium sulphate. -- Bitter vetch (Bot.), a name given to two European leguminous herbs, Vicia Orobus and Ervum Ervilia. -- To the bitter end, to the last extremity, however calamitous.()()n. Any substance that is bitter. See Bitters.()v. t. To make bitter.(Wolcott.)