Căt/a-năd'ro-moŭs, a.

a. [From Gr. κατά, down, ἀνά, up, and δρόμος, a running, course, from δραμεῖν, inf. aor. of τρέχειν, to run.] (Ichth.) Passing once a year from salt water into fresh, and returning, as is the habit of some fish.