1. (phylum Bryozoa) The major subphylum of bryozoans, in which the lophophore (feeding and respiratory organ) surrounds the mouth but not the anus (in contrast to the Entoprocta). Many possess a calcite skeleton. Ectoprocts are mostly, but not exclusively, marine, and have an extensive fossil record from the Ordovician to the present.

2. Alternative name for Bryozoa.