A person with a gray head or gray hair; an older person, or a type of diving duck with gray coloring on its head.
Compound word from gray plus head, describing either a human with gray hair or a bird species. The duck meaning comes from ornithological observation of the bird's distinctive gray head markings.
English borrowed 'grayhead' from nature observation—early naturalists named birds by the most obvious visual feature, and the grayhead duck still carries that descriptive name today!
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