ろっぽうかいめん 六放海綿 LinksSentence search for 六放海綿Sentence search for ろっぽうかいめんKanji details for 六, 放, 海 and 綿Edit in JMdict Noun1. hexactinellid sponge; glass sponge (any sponge of class Hexactinellida) Discussions Log in to talk about this word.