CTENIDIUM Meaning of CTENIDIUM in English [ tɪ'nɪdɪəm ]■ noun ( plural ctenidia -dɪə ) Zoology a comb-like respiratory organ in a mollusc.Originmod. L., from Gk ktenidion , dimin. of kteis , kten- 'comb'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004