- 欧氏几何 ōushìjǐhé Euclidean geometrysystem of geometry based on the work of the Greek mathematician Euclid
- 欧氏几何学 ōushìjǐhéxué Euclidean geometryA branch of mathematics based on the definitions and axioms of the ancient Greek mathematician [[欧几里得|歐幾里得|ou1 ji3 li3 de2]].
- 欧氏算法 ōushìsuànfǎ Euclidean algorithmefficient method for computing the greatest common divisor of two integers or polynomials
- 欧氏管 ōushìguǎn eustachian tubethe auditory tube connecting the middle ear to the nasopharynx