plural noun
Can·​cel·​la·​ri·​idae | \(ˌ)kanˌseləˈrīəˌdē\

Definition of Cancellariidae 

: a family of herbivorous marine snails (order Pectinibranchia) having nonoperculate oval shells strongly sculptured with axial ribs and spiral ridges forming a latticelike pattern — see cancellaria

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History and Etymology for Cancellariidae

New Latin, from Cancellaria, type genus + -idae

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