1. A reference to aquatic living things thriving in the still backwaters of rivers and streams: On his most recent expedition, Dr. Solomon, a biologist, discovered a unique flowering tychopotamic plant in the slowly moving flow in a channel which he had never seen before during his explorations.
2. Pertaining to something that lives in fresh water: Mary's nephew likes to go fishing for tychopotamic fish in the creeks near his farm.

Tychopotamic plants and animals are usually found in brooks.