| 释义 | as·troid I. \ˈaˌstrȯid\ adjective
 Etymology: Greek astroeidēs starlike, from astr- + -oeidēs -oid
 : shaped like a star
 II. noun
 (-s)
 Etymology: astr- + -oid
 : a hypocycloid of four cusps, the radius of the rolling circle being one fourth that of the fixed circle
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