hamadryad
In Greek and Roman mythology, a wood nymph who lives in a tree and dies when the tree dies. See also dryad.
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Via Latin from Greek hamadruas, from ἅμα (hama), "together", and δρῦς (drus), "tree."
References
Source
- Smith, William. (1870). Dictionary of Greek and Roman Biography and Mythology. London: Taylor, Walton, and Maberly.