[ roo-bee-kround ]
/ ˈru biˌkraʊnd /
an olive-gray, American kinglet, Regulus calendula, the male of which has an erectile, ruby crest.
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Origin of ruby-crowned kinglet
An Americanism dating back to 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019