Etymology
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ecliptic (n.)

"the circle in the sky followed by the Sun," late 14c., from Medieval Latin ecliptica, from Late Latin (linea) ecliptica, from Greek ekliptikos "of an eclipse" (see eclipse (n.)). So called because eclipses happen only when the Moon is near the line. Related: Ecliptical.

updated on July 31, 2014

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Definitions of ecliptic from WordNet

ecliptic (n.)
the great circle representing the apparent annual path of the sun; the plane of the Earth's orbit around the sun; makes an angle of about 23 degrees with the equator;
all of the planets rotate the sun in approximately the same ecliptic
From wordnet.princeton.edu, not affiliated with etymonline.