ˌserəˈthīəˌdē noun plural
Usage: capitalized
Etymology: New Latin, from Cerithium, type genus + -idae
: a family of slender elongated spirally coiled gastropod mollusks (order Pectinibranchia) comprising the horn shells of fresh and brackish waters
• ce·rith·i·oid səˈrithēˌȯid adjective