pec·tini·bran·chi·ate I. \| ̷ ̷ ̷ ̷ ̷ ̷|braŋkēə̇t, ̷ ̷| ̷ ̷ ̷ ̷-, -ēˌāt\adjective alsopec·tini·bran·chi·an\-ēən\ Etymology: New Latin Pectinibranchia + English -ate or -ian : of, relating to, or resembling the Pectinibranchia : having gills that resemble combs II. noun alsopectinibranchian\“\ (-s) : a mollusk of the order Pectinibranchia