Word Chains (Last 2 Letters)

crap I had to look this one up

ctenidium

cte·nid·i·um [ tə níddee əm ] (plural cte·nid·i·a [ tə níddee ə ])

noun
Definition:
mollusk's gill: a gill found in mollusks that has a central axis with a fringe of filaments on each side. It is used in gas exchange and filter feeding.
 
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