astroid
1 of 2adjective
as·troid
ˈaˌstrȯid
: shaped like a star
astroid
2 of 2noun
"
plural -s
: a hypocycloid of four cusps, the radius of the rolling circle being one fourth that of the fixed circle
Word History
Etymology
Adjective
Greek astroeidēs starlike, from astr- + -oeidēs -oid
Noun
astr- + -oid