[diˈkei]
①腐化，腐烂：死亡的有机物逐渐分解；②衰变，蜕变：衰退的过程或时期，如衰老化
习惯用语beta decay
β〔质点〕衰变：不稳定的放射性核素的核分裂，虽质量数未变，但原子序数增加或减少1，因为发射了一个带负电荷或正电荷的β粒子及一个中微子radioactive decay
放射性衰变：通过自动发射荷电的粒子和／或光子而使不稳定核素的核分裂tone decay
〔阈〕音调衰减：由于有持续可听到的音而使听阈敏感性降低- sedimentable
- sedimentation
- sedimentator
- 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