Definition of rorqual
: any of a family (Balaenopteridae) of large baleen whales that have relatively small heads, short, broad plates of baleen, and the skin of the throat marked with deep longitudinal furrows and that include the blue whale, humpback whale, minke whale, fin whale, and sei whale
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Merriam-Webster unabridged
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Time Traveler for rorqual
The first known use of rorqual was in 1824
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