高反 Traditional form: 高反 Pinyin (reading): gāofǎn Definitions: altitude sickness abbr. for 高原反應/高原反应 (gāoyuánfǎnyìng) Characters: 高 - tall, lofty; high, elevated 反 - reverse, opposite; contrary, anti- Traditional characters: 高 - tall, lofty; high, elevated 反 - reverse, opposite; contrary, anti-