echinus + -oid entry 1, after New Latin Echinoidea, class name
1864, in the meaning defined above
Echinodorus
echinoid
echinology
“Echinoid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/echinoid. Accessed 25 Dec. 2024.
Britannica.com: Encyclopedia article about echinoid
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