Definition of Athyrium
: a genus of ferns (family Polypodiaceae) differing from Asplenium (in which it is often included) in having curved or lunate sori — compare lady fern
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Origin and Etymology of athyrium
New Latin, irregular from Greek athoros without sperm (from a- 2a- + thoros semen) + New Latin -ium; akin to Middle Irish dairim I leap upon, Sanskrit dhārā stream
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