(ˌmɛzəˈbɛnθəs; ˌmɛsə-) n (Environmental Science) flora and fauna living at the bottom of seas 182 to 914 metres deep[from meso- + Greek benthos depth of the sea]
mesobenthos
mesobenthos
[¦me·zō¦ben‚thäs] (oceanography) The sea bottom at depths of 100-500 fathoms (180-900 meters).