incurrent

/ɪnˈkɜrənt/
adjective
  1. Carrying or allowing a flow inward, especially of water or air; used in biology to describe passages or openings that bring fluid into an organism.
    • The incurrent siphon of the clam brings in oxygen-rich water.
    • Sponges have incurrent pores that draw water into their bodies.
    • In fish, the incurrent nostril allows water to enter the olfactory chamber.
Antonyms