| apex [`ā´peks] ANATOMY 1. The upper portion of a lung extending into the root. 2. The pointed end of the heart. 3. The tip of the root of a tooth. BOTANY The pointed tip of a leaf. ENGINEERING In architecture or construction, the highest point, peak, or tip of any structure. GEOLOGY The part of a mineral vein nearest the surface of the earth. MATHEMATICS 1. The vertex of a triangle opposite the side which is regarded as the base. 2. The vertex of a cone or pyramid. |