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Definition of Hexactinellid
1. a. Having six-rayed spicules; belonging to the Hexactinellinæ.
Definition of Hexactinellid
1. Noun. Any of many sponges, of the class ''Hexactinellida'', that have hexactine spicules; the glass sponges ¹
¹ Source: wiktionary.com
Medical Definition of Hexactinellid
1.