from The Century Dictionary.
- Possessing more than two cotyledons, as an embryo; producing an embryo with more than two cotyledons, as a plant.
Sorry, no etymologies found.
Some of these cases may be accounted for by chorisis or by a cleavage of the original cotyledons, as happens, according to Duchartre,  in some Coniferæ, which he considers to be improperly termed polycotyledonous.
Next, omitting another inconspicuous tribe, there follows a very important class, the gymnogens — polycotyledonous trees, represented by the comferæ and cycadaceæ.
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The Old Red flora seems to have been prevailingly an acrogenic flora; and yet with almost its first beginnings, -- contemporary with at least the earlier fossils of the system in Scotland, we find a true polycotyledonous tree, not lower in the scale than the araucarites of the Coal Measures, -- which in structure it greatly resembles, -- or than the pines or cedars of our own times (see Fig. 3).
Gymnogens, -- polycotyledonous trees, represented by the conifers; and cycadaceæ.
a gymnospermous or polycotyledonous tree, and which we find associated with remains of Coccosteus and Diplacanthus.