from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An instrument for measuring the degree and nature of respiration.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A device used to measure the rate of respiration of plants
from The Century Dictionary and Cyclopedia
- n. An instrument which is used to determine the condition of the respiration.
- n. An apparatus for supplying air to a diver under water by means of a supply of compressed oxygen, which is caused to combine in due proportion with nitrogen chemically filtered from the air expired from his lungs in breathing.
Sorry, no etymologies found.