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Answer for the clue "A line drawn on a map connecting points having the same numerical value of some variable ", 8 letters:
isarithm

Word definitions for isarithm in dictionaries

WordNet Word definitions in WordNet
n. a line drawn on a map connecting points having the same numerical value of some variable [syn: isogram , isopleth ]

Wiktionary Word definitions in Wiktionary
n. An isoline, or contour line.