Glossary: 0-9 : A : B : C : D : E : F : G : H : I : J : K : L : M : N : O : P : Q : R : S : T : U : V : W : X : Y : Z
- o-Phenylenediamine Dihydrochloride (OPD)
- Obesity
- Oblique Plane Microscopy
- Obsidian
- Obsidian as a Testing Stone for Gold
- Occlusive
- Ocean Darkening
- Oculopharyngeal Muscular Dystrophy
- Ofloxacin
- Oganesson (Og)
- Oleochemical
- Oligodendrocyte Progenitor Cell
- Oligonucleotide
- Oligonucleotide Synthesis
- Oligosaccharide
- Oncology
- Oppositional Defiant Disorder
- Optical Interferometry
- Optical Projection Tomography
- Optical Sectioning
- Optical Waveguide-Based Biosensor
- Optoelectronics
- Orbital Shaking Bioreactor
- Orchesella cincta
- Oreochromis niloticus
- Organ-on-a-Chip Technology
- Organometallic Chemistry
- Ornithine Cycle
- Oryctolagus cuniculus
- Oryza sativa
- Oryza sativa subsp. japonica
- Oryzias latipes
- Osmium (Os)
- Otolemur garnettii
- Ototoxicity
- Ovary
- Ovis aries
- Oxalatonickelates
- Oxidative Stress Biomarker
- Oxpecker
- Oxygen (O)
- Oxygen Cycle
- Oxytocin
