6 letters · 10 points in Scrabble
verb reason by deduction; establish by deduction
verb obtain
verb come from
originFrom Middle English deriven, from Old French deriver, from Latin dērīvō (“to lead, turn, or draw off (a liquid), draw off, derive”), from dē (“away”) + rīvus (“a stream”); see rival. Unrelated to arrive.
Etymology from Wiktionary, CC BY-SA 3.0