- Hexagonal system
- Principle of complementarity
- Object-oriented language
- Combustion chamber
- Disinfectants
- Glabella
- Crystal chemistry
- Virus
- Convulsion
- Volcanism
- Trachea
- Hydrology
- Pistil
- Galactorrhoea
- Full Moon
- Almond
- Ailanthus
- Photosphere
- Massive Compact Halo Objects
- Condensation
- Sauropoda
- Achlorhydria
- Autonomous
- Surveyor
- Air brake
- Haemodynamics
- Supergravity
- ADD
- Neoteny
- Abiotic