- An animal that characteristically lives commensally in the nest, burrow, or dwelling place of an animal of another species.
- Being or living as an inquiline.
- In <em>zoology</em>, an animal that lives in an abode properly belonging to another, either at its expense, as certain insects that live in galls made by the true gall-insects, or merely as a cotenant, as a pea-crab which lives in an oyster-shell, or a sea-anemone growing on a crab's back; a commensal. See cut under <internalXref urlencoded="cancrisocial">cancrisocial</internalXref>.
- Having the character of an inquiline; commensal.
- A gallfly which deposits its eggs in galls formed by other insects.
- An <xref>animal</xref> that lives <xref>commensally</xref> in the <xref>nest</xref>, <xref>burrow</xref>, <xref>gall</xref>, or <xref>dwelling place</xref> of an animal of another <xref>species</xref>.
- An <xref>organism</xref> that lives within a <xref>reservoir</xref> of water collected in the <xref>hollow</xref> of a plant stem or leaf.