Definitions
from The Century Dictionary.
- noun In pharmacy, the rhizome of Dryopteris Filix-mas and D. marginalis, the oleoresin obtained from which is used for the expulsion of tape-worms.
- noun A genus of ferns variously limited, but in its broad sense including all those in which the dot-like sori are covered by a roundish, peltate, or reniform indusium.
- noun A genus of hymenopterous insects. Also
Aspidion .
Etymologies
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Examples
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The most important of the larger species are woodwardia, aspidium, asplenium, and, above all, the common pteris.
The Yosemite John Muir 1876
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