2 entries found for meridian.
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meridian prime meridian

Main Entry: me·rid·i·an
Pronunciation: m-rid--n
Function: noun
Etymology: Middle English meridien "midday," from early French meridien (same meaning), derived from Latin meridies "noon," from meri- (altered form of medius "middle") and dies "day" --related to DIARY, ¹MEDIAN
1 : the highest point reached
2 a : an imaginary circle on the earth's surface passing through the north and south poles b : the half of such a circle included between the poles c : a line on a globe or map representing such a circle or half circle and numbered by degrees of longitude

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