curvature[noun]Synonyms: curve, arc, arch, bend, bow, curvation, round
 [TahlilGaran] English Synonym Dictionary ▲
 cur‧va‧ture /ˈkɜːvətʃə $ ˈkɜːrvətʃər/ 
 noun [uncountable and countable] technical[
Date: 1400-1500; 
Language: Latin; 
Origin: curvatura, from curvare;  ⇒ curve2]
 the state of being curved, or the degree to which something is curved
curvature of the curvature of the Earth’s surface
 the curvature of the Earth’s surface He suffered from curvature of the spine.
 He suffered from curvature of the spine.  [TahlilGaran] Dictionary of Contemporary English ▲