Wiktionary
isograv
n. 1 A line on a map joining points of equal gravity potential (approximately coinciding with a contour line). 2 (context medicine English) Abbreviation of isogravity (equal seriousness). 3 (context physics English) Abbreviation of isogravity theory, combining gravity with other fundamental forces. 4 (context science English) Abbreviation of iso''(specific)''gravity (equal density).