Ma'anar ƙamus na hydroxide wani sinadari ne mai ɗauke da hydroxyl ion (OH-) azaman ƙungiyar da ba ta da kyau. Yawanci an yi shi da ion ƙarfe da aka haɗa zuwa ɗaya ko fiye ƙungiyoyin hydroxyl, kuma yawanci tushe ne mai ƙarfi. Misalan hydroxides sun haɗa da sodium hydroxide (NaOH) da calcium hydroxide (Ca(OH)2), waɗanda aka fi amfani da su a masana'antu da dakunan gwaje-gwajen sunadarai.
