IPA: //ɪˈzærɪθəm//
KK: /ɪˈzærɪθəm/
A line on a map that connects points with the same numerical value of a certain variable.
The isarithm on the weather map shows areas of equal temperature.
Isarithm is derived from the Greek roots 'isos' (meaning equal) and 'arithmos' (meaning number). The term refers to a concept related to equal numbers or values, often used in mathematical contexts.
Think of 'equal' ('isos') and 'number' ('arithmos') to remember that isarithm relates to equal numbers.