(organic chemistry) Describing the name of an organic compound that has two parts, the first describing the alkyl, aryl or derived group, and the second describing the functional group: e.g. methyl...

(botany) Provided with ochrea, or sheath-formed stipules, as the rhubarb, yellow dock, and knotgrass.

Any of several plants of the genus Dryas; the mountain avens. / One of two periods of cold and increased glaciation thousands of years before the present (Younger Dryas and Older Dryas).

A person who sightsees from an aircraft.