prostomium
noun
pro·sto·mi·um
prō-ˈstō-mē-əm
plural prostomia
prō-ˈstō-mē-ə
: the portion of the head of an annelid worm (such as an earthworm) that is situated in front of the mouth
Cite this Entry
“Prostomium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/prostomium. Accessed 11 Mar. 2025.
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