ac·i·do·phil·ic \|asə(ˌ)dō|filik, ə|sidə|filik\adjective orac·i·doph·i·lous\|asə|däf(ə)ləs\ Etymology:acid (II) + -o- + -philic, -philous 1.biology: staining readily with acid stains 2.: preferring or thriving (as of certain bacteria) in a relatively acid environment — see aciduric