隱顯 yǐnxiǎn appearing and disappearing Origin Definitions Defs Strokes Stroke Words Sentences Sents 隐显目标 yǐnxiǎnmùbiāo intermittent target a target that appears and disappears periodically隐显墨水 yǐnxiǎnmòshuǐ invisible ink a colorless ink that disappears after writing and must be heated or treated with a specific chemical solution to become visible