noun, plural ctenidia [ti-nid-ee-uh] . Zoology.
any of various comblike or featherlike structures, as the row of stiff bristles on the legs of a psocid.

1880–85; < Neo-Latin; see cteno-, -idium

ctenidial, adjective
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World English Dictionary
ctenidium (tɪˈnɪdɪəm)
n , pl -ia
one of the comblike respiratory gills of molluscs
[C19: New Latin, from Greek ktenidion, diminutive of kteis comb]

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