Crossword clues for the word: NITROUS The word NITROUS has appeared as an answer to at least 8 crossword clues on different crossword puzzles. Crossword clues for NITROUS Showing 1 to 8 of 8 results Clue(s) — oxide (anesthetic) — oxide (laughing gas) "Dentistry number, familiarly" "Engine-power booster, ___ oxide gas" Containing a certain salt. Kind of acid Laughing gas, familiarly Of a chemical compound