ˌ ̷ ̷ ̷ ̷ˈbathə̇ˌthərm noun
Etymology: is- + bathy- + -therm
: a line connecting points on the earth's surface where a certain temperature is found at the same depth
• iso·bathy·ther·mal | ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷|thərməl or iso·bathy·ther·mic -mik adjective