- Something that bisects, especially a ray that bisects an angle.二等分物，尤指平分一个角的直线
- spina bifida
- spinach
- spinaches
- spinage
- spinages
- spinal
- spinal anesthesia
- spinal canal
- spinal column
- spinal cord
- spinal ganglion
- spinal meningitis
- spinal nerve
- spinals
- spin angular momentum
- spin casting
- spin control
- spindle
- spindle cell
- spindled
- spindle element
- spindle fiber
- spindles
- spindle tree
- canton