Achilleum

== Translingual == === Etymology === From Achilles, from the idea that the Greeks put these or similar sponges under their helmets and greaves as shock absorbers, erected in 1815; last used for species in 1841. === Proper noun === Achilleum n (obsolete) A (variously defined) taxonomic grouping of sponges (or zoophytes). === References === Achilleum at Index to Organism Names