: a class of compound words typically having a noun as second constituent and a descriptive adjective as first constituent (as bluegrass, blackberry), a noun as second constituent and an attributive noun as first constituent (as houseboat), or an adjective as second constituent and an adverb as first constituent (as everlasting, widespread) and having meanings that follow the formula "a B that is A " for nouns or "B in the manner expressed by A " for adjectives, where A stands for the first constituent and B for the second
also
: a compound word belonging to this class
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Merriam-Webster unabridged
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