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.
Report Abuse. If it were possible to travel at the speed of light, it would take you just over four hours. Any realistic travel will take longer than that-substantially longer. It took Voyager 2 over 12 years to reach Neptune.eport Abuse. If it were possible to travel at the speed of light, it would take you just over four hours. Any realistic travel will take longer than that-substantially longer. It took Voyager 2 over 12 years to reach Neptune.