noun
a small, soft-bodied insect that feeds on the sap of conifers and can cause damage to trees
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The adelgid is a tiny insect that feeds on hemlock trees.
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I heard that adelgids are causing a lot of damage to the trees in the park.
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Those adelgids are like little tree vampires, sucking the life out of everything.
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The adelgid infestation was like a plague, slowly destroying the forest.