| a. | 1. | (Zool.) Ascending rivers from the sea, at certain seasons, for breeding, as the salmon, shad, etc. |
| 2. | (Bot.) Tending upwards; - said of terns in which the lowest secondary segments are on the upper side of the branch of the central stem. |
| Adj. | 1. | anadromous - migrating from the sea to fresh water to spawn Antonyms: catadromous - migrating from fresh water to the sea to spawn diadromous - (used of fish) migratory between fresh and salt waters |