Hypertext Webster Gateway: "catadromous"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
2. (Zo["o]l.) Living in fresh water, and going to the sea to
spawn; -- opposed to {anadromous}, and said of the eel.
From WordNet (r) 1.7 (wn)
catadromous
adj : migrating from fresh water to the sea to spawn [ant: {diadromous},
{anadromous}]
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