Ca‐tad″ro‐mous (?), a. [Gr. κατά down + δρόμοσ a running.] 1. (Bot.) Having the lowest inferior segment of a pinna nearer the rachis than the lowest superior one; — said of a mode of branching in ferns, and opposed to anadromous.
2. (Zoöl.) Living in fresh water, and going to the sea to spawn; — opposed to anadromous, and said of the eel.