- Same as <internalXref urlencoded="zo%C5%93cium">zoœcium</internalXref>.
- The ectocyst, or outer chitinous or calcified cell, in which a polypide of the <em>Polyzoa</em> is lodged, and into which a polypide can be retracted after protrusion; one of the cells of the cœnœcium, containing a polypide.
- One of the cells or tubes which inclose the feeling zooids of Bryozoa. See <ex>Illust.</ex> of <xref urlencoded="sea%20moss">sea moss</xref>.
- One of the cells or tubes which enclose the feeling <xref>zooids</xref> of <xref>Bryozoa</xref>.