noun
or chalcedon butterfly (ˈ)kal|sēd ə n, ˈkalsəˌdän
( -s )
Etymology: New Latin chalcedona (specific epithet of Euphydryas chalcedona ), probably irregular from Late Latin chalcedonius chalcedony — more at chalcedony
: a common butterfly ( Euphydryas chalcedona ) of western No. America having black wings speckled with yellow and brownish orange