Etymology
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hamadryad (n.)

late 14c., from Greek hamadryas (plural hamadryades) "wood-nymph," fabled to die with her tree, from hama "together with" (from PIE root *sem- (1) "one; as one, together with") + dryas (plural dryades) "wood nymph," from drus (genitive dryos) "tree," especially "oak" (from PIE root *deru- "be firm, solid, steadfast," with specialized senses "wood, tree"). Use in 19c. biology for a type of butterfly, a type of venomous Indian serpent, and a type of large hairy baboon.

updated on September 19, 2021

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Definitions of hamadryad from WordNet

hamadryad (n.)
the nymph or spirit of a particular tree;
hamadryad (n.)
large cobra of southeastern Asia and the East Indies; the largest venomous snake; sometimes placed in genus Naja;
Synonyms: king cobra / Ophiophagus hannah / Naja hannah
From wordnet.princeton.edu, not affiliated with etymonline.