hygro Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition adjective. relating to moisture or wetness. Example Sentence Hygro is the root of hyrometer - an instrument for measuring relative humidity. More Example Sentences Hygro plants thrive in wet environments. Synonyms moist; damp; wet Hear It! Say It! Write It! hygro Switch to cursive Start Share with your friends: