Explore science words that start with o.
Science Words that Start With O
Here are 100 science words that start with “O”:
- Oxygen
- Organism
- Oscillation
- Orbit
- Osmosis
- Optics
- Ozone
- Organ
- Observation
- Organic
- Ovary
- Offspring
- Objective
- Operator
- Oxidation
- Olfactory
- Overpopulation
- Osmoregulation
- Olfaction
- Ontogeny
- Oocyte
- Outlier
- Origin
- Optimum
- Oligonucleotide
- Opsonization
- Osseous
- Oncogene
- Operator gene
- Omnidirectional
- Orthogonal
- Operon
- Oviparous
- Overlapping
- Optogenetics
- Ontology
- Orthopedics
- Oogenesis
- Overdose
- Oxidative stress
- Osmolarity
- Orbital
- Organogenesis
- Oncology
- Osteoblast
- Overexpression
- Osmotic pressure
- Ontological
- Ornithology
- Optic nerve
- Olfactory bulb
- Outer space
- Optimal growth
- Organ system
- Outcrossing
- Overweight
- Olfactory receptor
- Oncofetal antigen
- Ossification
- Orthologous
- Organ transplant
- Objectivity
- Ovarian follicle
- Outcrop
- Oviparity
- Optical illusion
- Osmoreceptor
- Ovary cancer
- Osteoclast
- Osmotic potential
- Oviposition
- Onychomycosis
- Orthodontics
- Octahedral
- Outgassing
- Organellar
- Overhunting
- Oxidative phosphorylation
- Oligosaccharide
- Open system
- Outer membrane
- Ornamental
- Optic chiasm
- Oncolytic virus
- Osteocyte
- Oxygenation
- Ovipositor
- Ocular
- Oncogenic
- Osteoporosis
- Obligate
- Odontoblast
- Oxytocin
- Organophosphate
- Ozone layer
- Olfactory cortex
- Osmolality
- Oculomotor
- Overdominance
Related: Science Words A to Z
Science Words That Start With O (By Grade)
Science Words That Start With O (4th Grade):
- Oxygen
- Orbit
- Organism
- Ocean
- Observation
- Ozone
- Owl
- Octopus
- Optics
- Offspring
- Object
- Oil
- Onion
- Oar
- Orbit
- Opal
- Oak
- Oxygenate
- Oscillate
- Oarfish
Science Words That Start With O (5th Grade):
- Oxygen
- Orbit
- Organism
- Oceanography
- Observation
- Ozone layer
- Omnivore
- Optics
- Offspring
- Objectivity
- Oil spill
- Onion cell
- Oscillation
- Organic compound
- Oxidation
- Odorant
- Osmosis
- Osmoregulation
- Outcrop
- Orogeny
Science Words That Start With O (6th Grade):
- Organic chemistry
- Osmotic pressure
- Oxygenation
- Organic molecule
- Oscilloscope
- Ozone depletion
- Ocular anatomy
- Oogenesis
- Outlier
- Oligonucleotide
- Osmotic potential
- Organ system
- Oxidative stress
- Osmotic equilibrium
- Open circuit
- Optimal growth
- Oceanic crust
- Olfactory receptor
- Oxidative phosphorylation
- Osteoblast
Science Words That Start With O (7th Grade):
- Oogenesis
- Organic synthesis
- Osteoporosis
- Oxidative damage
- Optogenetics
- Osmoreceptor
- Osmotic regulation
- Oligosaccharide
- Omics technologies
- Ocean acidification
- Operant conditioning
- Orthopedics
- Oxidative metabolism
- Oncogene
- Oviparous
- Orthogonal projection
- Oxidative stress response
- Osmoregulatory hormone
- Optical coherence tomography
- Olfactory bulb
Science Words That Start With O (8th Grade):
- Organic synthesis
- Oncolytic virus
- Osmoregulation mechanism
- Oxidative damage repair
- Opioid receptor
- Optical fiber
- Oogenesis process
- Oligodendrocyte
- Oxytocin hormone
- Oxidative folding
- Olfactory cortex
- Optical tweezer
- Ozone depletion potential
- Open-field test
- Oxyfuel combustion
- Ovulation induction
- Optical coherence microscopy
- Olfactory discrimination
- Oncolytic virotherapy
- Orthopedic surgery
Science Words Starting With O (By Subject)
Physics Words That Start With O:
- Oscillation
- Ohm
- Optics
- Orbit
- Oscilloscope
- Ohm’s law
- Observational study
- Optical fiber
- Orbital
- Operator
- Oscillator
- Overtones
- Oxidation
- Oersted
- Oscillatory motion
- Occam’s razor
- Optical density
- Ohmic conductor
- Out-of-phase
- Osmosis
Chemistry Words That Start With O:
- Oxidation
- Organic
- Oxidizing agent
- Oxidation state
- Octet rule
- Oxygen
- Orbital
- Organic chemistry
- Oxide
- Optical isomerism
- Oxidative stress
- Ozone
- Olefin
- Orthogonal
- Oxime
- Oxaloacetate
- Optical activity
- Ozonolysis
- Osmolarity
- Oligomer
Biology Words That Start With O:
- Organism
- Osmosis
- Organelle
- Oxygen
- Ovary
- Osteoblast
- Oogenesis
- Optic nerve
- Olfactory
- Organ system
- Osmoregulation
- Oviparous
- Oviduct
- Olfactory bulb
- Ovulation
- Operon
- Osteoclast
- Oxytocin
- Orthologous genes
- Olfactory receptor
Math Words That Start With O:
- Operation
- Operator
- Order
- Orthogonal
- Outcome
- Odds
- Octagon
- Octave
- Ordinal
- Origin
- Odd number
- One-to-one
- Observational data
- Open set
- Orthocenter
- Orthogonality
- Onto
- Oscillatory
- Octahedron
- Overlapping circles
Physical Science Words That Start With O:
- Ohm’s law
- Oscillation
- Osmosis
- Optics
- Oxygen
- Ozone
- Ohmic conductor
- Orbit
- Observational study
- Oort cloud
Science Words Beginning with O with Meaning:
- Oxygen: Chemical element with the symbol O and atomic number 8.
- Ozone: Triatomic form of oxygen, protecting Earth’s atmosphere.
- Organism: Living individual, capable of carrying out life processes.
- Oceanography: Study of the Earth’s oceans, their properties, and phenomena.
- Orbit: Path followed by an object around another due to gravity.
- Optics: Study of light and its behavior.
- Oscillation: Back-and-forth motion around a central point.
- Ontogeny: Individual development from embryo to adult.
- Omnivore: Animal that consumes both plants and animals.
- Organ: Structurally distinct part of a living organism with a specific function.
- Overpopulation: Excessive population in relation to available resources.
- Olfaction: Sense of smell.
- Oblique: Not perpendicular or parallel, slanting or sloping.
- Osmosis: Diffusion of solvent molecules through a semipermeable membrane.
- Optimum: Best or most favorable condition or degree.
- Outcrop: Exposed section of rock on the Earth’s surface.
- Overfishing: Depletion of fish populations beyond their ability to reproduce.
- Ozone layer: Region of Earth’s stratosphere with high ozone concentration.
- Organism: Living individual, capable of carrying out life processes.
- Outlier: Data point differing significantly from other observations.
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