pe·riph·y·ton (pə-rĭfĭ-tŏn)
n.
Sessile organisms, such as algae and small crustaceans, that live attached to surfaces projecting from the bottom of a freshwater aquatic environment.

[TahlilGaran] American Dictionary ▲

periphyton
[New Latin, from Greek periphuton, from neuter sing. of periphutos, planted all over, from periphuein, to grow around, cling to  : peri-, peri- + phuein, to grow; see bheuə- in Indo-European Roots.]

[TahlilGaran] American Dictionary ▲