单词 astroid 释义 astroid, a. and n.|strd|[f. Gr. ἀή star-like, f. ἀή star: see -oid.]A. adj. Star-shaped, star-like (cf. asteroid a.).1909in Webster.B. n. Geom. A hypocycloid with four cusps.1897H. Lamb Infinit. Calculus ix. 138 The ‘four-cusped hy...