isopleth

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a line drawn on a map connecting points having the same numerical value of some variable (Freq. 2)
• Syn:
isogram, isarithm
• Hypernyms:
line
• Hyponyms:
isobar, isochrone, isoclinic line, isoclinal, isohel, isotherm