incurrent

This term is primarily used in specialized biological and zoological contexts, particularly when describing the anatomy of sponges (Porifera) and other filter-feeding organisms. It describes the specific direction of fluid movement into a body or organ, contrasting with excurrent, which describes the outward flow.

Because it is a technical descriptor, it is rarely encountered in general conversation or non-scientific writing. It functions as a precise anatomical label rather than a general adjective for movement, meaning it should not be used to describe common inward motions like walking into a room.