subangularyoudaoicibaDictYouDict[subangular 词源字典]
"Somewhat or slightly angular; having an obtuse angle", Late 18th cent.; earliest use found in Thomas Pennant (1726–1798), naturalist, traveller, and writer. From post-classical Latin subangularis from classical Latin sub- + angulāris.[subangular etymology, subangular origin, 英语词源]