01 a. 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 …
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1.
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.(Bot.)
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2.
Living in fresh water, and going to the sea to spawn; -- opposed to anadromous, and said of the eel.(Zool.)