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echo a repetition of sound caused by reflection of sound waves from a surface, or a sound so produced. [8 definitions]
echocardiogram a sonogram of the heart.
echo chamber a room in a recording or broadcasting studio that is used to increase resonance or produce echo effects.
echoic like an echo. [2 definitions]
echolalia the uncontrollable repetition of words spoken by another person, often associated with autism spectrum disorder or with other developmental or mental disorders.
echolocation the process by which animals such as bats locate objects by emitting sounds and hearing them echoed. [2 definitions]
echo sounding a method of determining the depth of a body of water by measuring the time the echo of an emitted sound wave takes to return from the bottom.
éclair an oblong pastry filled with whipped cream or custard and usu. frosted with chocolate.
éclat brilliance of performance or achievement. [3 definitions]
eclectic drawing on or influenced by various styles, disciplines, systems or the like. [3 definitions]
eclecticism an eclectic method or system, or the practicing or advocating of such.
eclipse at a particular observation point, the blocking of light from one celestial body by another, such as the eclipse of the sun by the interposition of the moon, or the eclipse of the moon by the earth's coming between the sun and moon. [6 definitions]
eclipsing binary two stars that orbit a common center of gravity and periodically move in front of each other, causing a fluctuating magnitude.
ecliptic the apparent path of the sun, as seen from the earth against the background stars. [3 definitions]
eclogue a poem, usu. in dialogue form, about the charms of country life.
eco- habitat; environment; household.
ecocide the destruction of the environment or of ecological systems by indiscriminate exploitation of natural resources, dumping of chemical wastes, the use of defoliants and pollutants, and the like.
eco-friendly designed to cause minimal damage to the environment.
E. coli a species of bacteria, present in the intestines of all vertebrates, that is widely used in biological research.
ecological of or pertaining to ecology.
ecology the scientific study of the relationships between living things and their environments. [2 definitions]