The act or process of curving outward, or the state of being curved outward.
From excurvate + -tion, a Latin suffix creating nouns from verbs. The -tion suffix comes from Latin -tio, used to nominalize action verbs. Excurvation describes both the action and the resulting curved state.
Plant stems show excurvation when they grow upward and outward to reach sunlight—it's not just random growth but a calculated curve that biologists can measure and predict, showing how even plants solve geometric problems.
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