a kind of insect, (non-classical form of 珧) scallops, found in abundance in the China Sea; the shells contain mother-of-pearl, and the compressor muscle or ligament is dried and imported into China as Compoy ( 干貝); also called ( 江瑤柱) it is highly esteemed as an article of food, both in China and Japan
䖴【申集中】【虫部】 康熙筆画：12画，部外筆画：6画
《集韻》餘招切，音餆。《類篇》蟲名。
《正字通》同珧。引《六書故》：似蚌，其柱最珍。別見玉部。
珧【卷一】【玉部】
蜃甲也。所以飾物也。从玉兆聲。《禮》云：“佩刀，天子玉琫而珧珌。”余昭切
（珧）蜃甲也。介物之㱿曰甲。所以飾物也。釋器曰。以蜃者謂之珧。按爾雅。蜃小者珧。東山經。嶧臯之水多蜃珧。傳曰。蜃、蚌屬。珧、玉珧。亦蚌屬。然則蜃珧二物也。許云一物者、據爾雅言之。凡物統言不分。析言有別。蜃飾謂之珧。猶金飾謂之銑、玉飾謂之珪。金不必皆銑、玉不必皆珪也。从王。兆聲。余昭切。二部。禮記曰。二字補。佩刀、天子玉琫而珧珌。見毛傳。按天子玉琫珧珌。僃物也。諸侯璗琫璆珌。讓於天子也。璆、美玉也。天子玉上。諸矦玉下。故曰讓於天子也。大夫鐐琫鏐珌。銀上金下也。士珕琫珧珌。珧有玉珧之偁。貴於珕。自諸矦至士皆下美於上。惟天子上美於下。毛詩集注、定本、釋文皆作諸矦璆珌。惟正義作諸矦鏐珌。又集注、定本、釋文皆作大夫鏐珌。惟正義作大夫鐐珌。又說文作士珧珌。正義作士珕珌。與說文異。