蚶貝きさがいMeanings1nounblood clam (Scapharca broughtonii)archaicArchaic term for the blood clam, now usually called 赤貝 (あかがい). Found in older texts or specialized historical contexts.See also: 赤貝古こ文ぶん書しょには「蚶貝きさがい」の名なで赤あか貝がいが記きされている。In old documents, the blood clam is recorded under the name 蚶貝.