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ash, in botany

(Encyclopedia)ash, in botany, any plant of the genus Fraxinus of the family Oleaceae (olive family), trees and shrubs mainly of north temperate regions. The ashes are characterized by small clusters of greenish flo...

march, in music

(Encyclopedia)march, in music, composition intended to accompany marching. The only constant characteristics of a march are duple meter and a fairly simple rhythmic design. In mood, marches range from the moving de...

marguerite, in botany

(Encyclopedia)marguerite: see daisy.

medusa, in zoology

(Encyclopedia)medusa, in zoology, scientific name for the jellyfish, i.e., the free-swimming stage of various animals in the phylum Cnidaria. See polyp and medusa. ...

memory, in computing

(Encyclopedia)memory, in computing: see computer. ...

memory, in psychology

(Encyclopedia)memory, in psychology, the storing of learned information, and the ability to recall that which has been stored. It has been hypothesized that three processes occur in remembering: perception and regi...

kea, in zoology

(Encyclopedia)kea: see parrot.

arc, in electricity

(Encyclopedia)arc, in electricity, highly luminous and intensely hot discharge of electricity between two electrodes. The arc was discovered early in the 19th cent. by the English scientist Sir Humphry Davy, who so...

arc, in geometry

(Encyclopedia)arc, in geometry, a curved line or any part of it; in particular, a portion of the circumference of a circle. The length s of an arc of a circle of radius r and subtending a central angle of θ radian...

key, in mechanics

(Encyclopedia)key, in mechanics: see lock and key. ...