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

A person who sightsees from an aircraft.

(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...

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).