ethmoidal foramen n.
Either of two foramina, anterior and posterior, formed by grooves on either edge of the ethmoidal notch of the frontal bone and by similar grooves on the ethmoid bone.
- Ethmoidal crest
ethmoidal crest n.
- Ethmoidal cell
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.