(meteorology) The altitude in the Earth's atmosphere below which turbulent mixing dominates, at about 60 miles or 100 km, which separates the heterosphere from the homosphere.

The reflectance of an echo

Shaped like a nipple.

The pyrrole fungicide 4-(2,2-difluoro-1,3-benzodioxol-4-yl)-1H-pyrrole-3-carbonitrile