home / medterms medical dictionary a-z list / ethmoid sinus definition Medical Definition of Ethmoid sinus Ethmoid sinus: A collection of air cells within the ethmoid bone, a spongy bone which makes up the front of the floor of the skull and the roof of the nose. From the Greek ethmos, sieve + eidos, resemblance = like a sieve.
Confidence votes 84.8K. It takes 4.05 hours to 4.12 hours for light from the sun to reach Neptune, depending where it is in it's orbit. It takes 4.05 hours to 4.12 hours for light from the sun to reach Neptune, depending where it is in it's orbit.
The rotation speed varies by location on the planet due to the gaseous atmosphere. However, the mean period (day) is about 16.11 Earth hours (16 hours, 6 minutes, 36 seconds).â¦ Neptune's revolution around the Sun takes about 165 Earth Years (164.79 years). About 16.1 hours and 165 Earth years, respectively, are.