Search Result for "catadromous": 
Wordnet 3.0

ADJECTIVE (1)

1. migrating from fresh water to the sea to spawn;


The Collaborative International Dictionary of English v.0.48:

Catadromous \Ca*tad"ro*mous\, a. [Gr. kata` down + dro`mos 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. [1913 Webster] 2. (Zool.) Living in fresh water, and going to the sea to spawn; -- opposed to anadromous, and said of the eel. [1913 Webster]
WordNet (r) 3.0 (2006):

catadromous adj 1: migrating from fresh water to the sea to spawn [ant: anadromous, diadromous]