| suspended structure | โครงสร้างประเภทแขวน (เต้นท์และพื้นแขวนจากหลังคา) |
| suspension bridge | สะพานแขวน |
| sway | การโย้, เอียง |
| symbol | สัญลักษณ์ |
| symmetry | สมมาตร |
| synthetic material | วัสดุสังเคราะห์ |
| synthetic stone | หินสังเคราะห์ |
| Scalar: | (english) A mathematical entity which has a numeric value but no direction (in contrast to a vector). |
| Section Modulus: | (english) A property of a cross sectional shape, which depends on shape, and orientation. Section modulus is usually denoted S, and S = I/c, where I = moment of inertia about an axis through the centroid, and c is the distance from the centroid to the extreme edge of the section. |
| Shear: | (english) An system of internal forces whose resultant is a force acting perpendicular to the longitudinal axis of a structural member or assembly: sometimes called shear force. |