Acalephae Definition
    noun
  
 A group of Coelenterata, including the medusas or jellyfishes, and hydroids, called sea nettles from their sting.
Wiktionary 
Origin of Acalephae
-  From Latin acalēphē (“nettle”), from Ancient Greek ἀκαλήφη (akalēphē, “stinging nettle”). From Wiktionary 
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