Gas Used for Calming Dental Patients

This page is the CodyCross answer for the clue below from Small World, Group 685, Puzzle 5 (Micro Sculptures).

Question is: Gas Used for Calming Dental Patients

and the answer is: NITROUS

Word Meaning:

NITROUS — (now historical) Pertaining to or composed of nitre; having the properties of nitre, bitter.

Definitions from Wiktionary.