biangleWiktionary 原文/ˈbaɪˌæŋɡəl/构词拆解bibi-前缀angleangle词干bi-Two in number. · Having or possessing two of the root word's quality.词源说明From bi- + angle.释义名词noun1A digon or bigon; a two-sided shape (especially in non-Euclidean geometry)