Grade 7 water vapor Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. water in the form of a gas especially when below boiling temperature and spread through the atmosphere Example Sentence One state of the water cycle is water vapor. Synonyms steam; gaseous form of water; gas phase of water Antonyms ice Hear It! Say It! Write It! water vapor Switch to cursive Start Share with your friends: