| 释义 |
astroid, a. and n.|ˈæstrɔɪd|
[f. Gr. ἀστροειδής star-like, f. ἀστήρ 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 hypocycloid’..is sometimes called the ‘astroid’. |