English

isodose

From iso- + dose.

Formed from iso- + dose

Ancient Greek ἴσος ‘equal’

English iso-

Proto-Indo-European *deh₃- ‘to give’

…

Ancient Greek δίδωμι ‘to give’

Ancient Greek δόσις ‘a portion prescribed’

Late Latin dosis

Middle French dose

English dose

Today it means

noun A line (on a map, etc.) of equal dose of radiation.

Language periods are conventional ranges, not dates for this word.