| cut-off of reinforcement | ตำแหน่งหยุดเหล็กเสริมคอนกรีต |
| cut-off wall | กำแพงกั้นน้ำ |
| cut roof | หลังคาตัด |
| cyclone | ที่ดักฝุ่น, พายหมุน |
| cylinder mold | แบบหล่อคอนกรีตรูปทรงกระบอก |
| cylinder strength | กำลังคอนกรีตรูปทรงกระบอก |
| cylinder test | การทดสอบคอนกรีตรูปทรงกระบอก |
| Center of Gravity (CG): | (english) The location of the resultant of gravity forces on an object or objects: sometimes called center of mass. |
| Centroid: | (english) Similar to the concept of center of gravity, except that it applies to a two dimensional shape rather than an object. For a given shape, the centroid location corresponds to the center of gravity for a thin flat plate of that shape, made from a homogeneous material. |
| Component (of a vector): | (english) Any vector can be expressed as a collection of vectors whose sum is equal to the original vector. Each vector in this collection is a component of the original vector. It is common to express a vector in terms of components which are parallel to the x and y axes. |