六放海綿 ろっぽうかいめん Meanings Noun hexactinellid sponge; glass sponge (any sponge of class Hexactinellida) Kanji 六 six. Read as ロク. 放 release. Read as ホウ. 海 sea. Read as カイ. 綿 cotton. Read as メン. Jinuma: Japanese Dictionary · Word lists