heptagonalWiktionary 原文/hɛpˈtæɡənəl/构词拆解heptagonheptagon词干al-al后缀-alOf or pertaining to. Adjectival suffix appended to various words, often nouns, to produce an adjective form. Often added to words of Latin origin, but used with other words also. · Forming nouns, especially of verbal action.词源说明Since 16th century, from heptagon + -al.释义形容词adjective1Having seven angles and sides.2(mathematics, of a number) Belonging to the sequence generated by the formula 5n2−3n2.同族词派生词 1heptagonally相关词 3heptagon·septangle·septangular