Etymology
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moonbeam (n.)

"ray of light from the moon," 1580s, from moon (n.) + beam (n.).

updated on February 20, 2019

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Definitions of moonbeam from WordNet

moonbeam (n.)
a ray of moonlight;
Synonyms: moon ray / moon-ray
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.