Etymology
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-derm 

word-forming element meaning "skin," from Greek derma "skin, hide, leather," from PIE root *der- "to split, flay, peel," with derivatives referring to skin and leather.

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dendro- 

word-forming element meaning "tree," from Greek dendron "tree," sometimes especially "fruit tree" (as opposed to hylē "timber"), from PIE *der-drew-, from root *deru- "to be firm, solid, steadfast," also forming words for "wood, tree."

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