parapodium
noun
para·po·di·um
ˌper-ə-ˈpō-dē-əm 
ˌpa-rə-
plural parapodia
ˌper-ə-ˈpō-dē-ə
ˌpa-rə-
1
: either of a pair of fleshy lateral processes borne by most segments of a polychaete worm
2
: a lateral expansion on each side of the foot usually forming a broad swimming organ in some gastropods
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“Parapodium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/parapodium. Accessed 23 Nov. 2024.
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