oxidised (Adjective) — Combined with or having undergone a chemical reaction with oxygen. ex. "the oxidised form of iodine"
oxidised (Verb) — (chemistry) add oxygen to or combine with oxygen.
oxidised (Verb) — Enter into a combination with oxygen or become converted into an oxide. ex. "This metal oxidises easily"
oxidised (Verb) — (chemistry) increase the valence (or the positive charge) of an element by removing electrons.