before a vowel, dec-, word-forming element meaning "ten," from Latinized combining form of Greek deka "ten" (from PIE root *dekm- "ten"). In the metric system, "multiplied by ten;" while deci- means "divided by ten."

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."

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.

word-forming element meaning "toward or on the right-hand side," from combining form of Latin dexter (from PIE root *deks- "right, opposite of left; south").

abstract suffix of state, from Old English dom "statute, judgment" (see doom (n.)). Originally an independent word, but already active as a suffix in Old English (as in freodom, wisdom). Cognate with German -tum (Old High German tuom). "Jurisdiction," hence "province, state, condition, quality."