ethmoidal cell n.
Any of the cavities in the ethmoid bone that are filled with air and that communicate with the nasal cavity.
- Ethmoidal artery
ethmoidal artery n.
noun, Chemistry. 1. . ethyl mercaptan A colorless organic liquid that has a very strong odor. It is added to odorless fuel, such as natural gas, and fuel systems as a warning agent in the event of leakage or spills. Also called ethanethiol. Chemical formula: C2H6S.
noun, Chemistry. 1. a colorless, sweet, water-insoluble, extremely explosive liquid, C 2 H 5 NO 3 , used chiefly in organic synthesis.
noun, Chemistry. 1. a colorless or yellowish, very volatile, highly aromatic, flammable liquid, C 2 H 2 NO 2 , used chiefly in the preparation of organic substances.