blaˈstȯidēə noun plural
Usage: capitalized
Etymology: New Latin, from blast- + -oidea
: a class, formerly considered a division of Crinoidea, of extinct Paleozoic short-stemmed or stemless pelmatozoan echinoderms shaped somewhat like a flower bud and having five ambulacral areas with slender appendages along their margins and flattened tubes along their internal surface
• blas·toi·de·an (ˈ) ̷ ̷| ̷ ̷dēən adjective or noun