- Symmetrical arrangement, as of an organism or a body part, along a central axis, so that the body is divided into equivalent right and left halves by only one plane.两侧对称：沿一条中轴身体被一平面分为左右同等的两部分的对称排列，如有机体或身体部分
- sextuplets
- sextuplicate
- sextuplicated
- sextuplicates
- sextuplicating
- sextupling
- sexual
- sexual abuse
- sexual assault
- sexual deviation
- sexual harassment
- sexual intercourse
- sexualities
- sexuality
- sexualize
- sexualized
- sexualizes
- sexualizing
- sexually transmitted disease
- sexual orientation
- sexual relations
- sexual selection
- sex work
- sexy
- sex–limited