- Proof
- Sinistral snail
- Sexual dimorphism
- Slurry pipeline
- Swollen lymph nodes
- Deletion
- CD-RW
- Velcro
- Morphogenesis
- Fumaroles
- Daemon
- Actinomorphic
- Bowel
- CEPT
- Fish-eye
- MediaFLO
- Soil pit
- Atomic number
- Sour cherry
- Tuberculosis
- Silkworm
- Mauritius parakeet
- Luyten, Willem
- CCITT No. 7
- Ununoctium
- Hydromorphy
- Acetaldehyde
- Luminance
- Angina
- Orange dwarf