Etymology
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larch (n.)
type of coniferous tree with needle-shaped deciduous leaves, 1548, (William Turner, "Names of Herbes"), from German Lärche, from Middle High German larche, from Old High German *larihha, from Latin larix (genitive laricis), probably a loan-word from an Alpine Gaulish language. De Vaan discourages the suggestion that it could be related to Old Celtic *darik- "oak."

Native to the Alps; the name later was extended to North American species. Compare Danish lærke, Dutch lorken, also from Latin. In French, Old French larice was replaced by mélèze (14c.), a word of uncertain origin.
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tamarack (n.)
also tamarac, North American black larch, 1805, probably of Algonquian origin (compare synonymous hackmatack, 1792, from a source akin to Abenaki akemantak "a kind of supple wood used for making snowshoes"), but the etymology is unclear.
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