牛牙(症)：异形牙的一种，其特点为磨牙呈棱晶形，髓腔增大，原因为牙根分支只见于中磨牙、第三根尖或未分支- sedopeptose
- seed
- Seeligmüller's sign
- Seessel's pouch(pocket)
- segment
- segmenta
- segmental
- segmentation
- segmenter
- Segmentina
- segmentum
- segregation
- segregator
- Sehrt's clamp(compressor)
- Seidel's scotoma(sign)
- Seidlitz powder;powder test
- Seignettes salt
- seisesthesia
- seismesthesia
- seismocardiogram
- seismocardiography
- seismotherapy
- seizure
- sejunction
- sekisanine