411 REFERENCE · Wiktionary
Achilleum
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
Translingual
Etymology
From Achilles, from the idea that the Greeks put these or similar sponges under their helmets and greaves as shock absorbers,1874, Norfolk and Norwich Naturalists' Society, Norwick Eng, Transactions, page 52 erected in 1815; last used for species in 1841.
Proper noun
1 n
mul obsolete A (variously defined) taxonomic grouping of sponges (or zoophytes).
References
Achilleum