Onward to the letter O, an outstanding starting point for some of the most fascinating words in science! We’ll orbit around ‘organism’ and ‘osmosis’ and offer you the opportunity to uncover their meanings.
This part of our science glossary is organized to help you grasp these terms with ease, ensuring anyone can join in on the exploration.
Science Words That Start With O
Here is the list of common science words 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
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Science Words With O (By Grade)
4th Grade Science Words With O:
- Oxygen
- Omnivore
- Organism
- Opaque
- Orbit
- Osmosis
- Organ
- Ovary
- Oil
- Olfaction
- Ovule
- Outcrop
- Oviparous
- Ozone
- Oxidation
- Omnivorous
- Optical
- Oscillation
- Omnivore
- Ore
5th Grade Science Words With O:
- Organism
- Omnivore
- Osmosis
- Opaque
- Orbit
- Oxygen
- Ozone Layer
- Organ
- Organ System
- Ovule
- Ovary
- Oxidize
- Olfactory
- Optics
- Omnivorous
- Outcrop
- Octet
- Ore
- Organic
- Oviparous
6th Grade Science Words With O:
- Organism
- Omnivore
- Osmosis
- Opaque
- Orbit
- Oxygen
- Ozone
- Organ
- Organ System
- Ovule
- Ovary
- Oxidation
- Omnivorous
- Outcrop
- Octet
- Ore
- Organic
- Oviparous
- Optical
- Oscillation
7th Grade Science Words With O:
- Organism
- Omnivore
- Osmosis
- Opaque
- Orbit
- Oxygen
- Ozone
- Organ
- Organ System
- Ovule
- Ovary
- Oxidation
- Omnivorous
- Outcrop
- Octet
- Ore
- Organic
- Oviparous
- Optical
- Oscillation
8th Grade Science Words With O:
- Organism
- Omnivore
- Osmosis
- Opaque
- Orbit
- Oxygen
- Ozone Layer
- Organ
- Organ System
- Ovule
- Ovary
- Oxidize
- Omnivorous
- Outcrop
- Octet
- Ore
- Organic
- Oviparous
- Optics
- Optical Isomer
Science Words Starting With O (By Subject)
Physics Words That Start With O:
- Ohm
- Optics
- Oscillation
- Orbital
- Ohm’s Law
- Opacity
- Optical Fiber
- Oscilloscope
- Overload
- Oersted
- Optoelectronics
- Orbital Velocity
- Order of Magnitude
- Orthogonal
- Outgassing
- Osmosis
- Ouverture
- Oscillator
- Outer Space
- Oxidation State
Chemistry Words That Start With O:
- Oxidation
- Orbital
- Osmosis
- Organic Chemistry
- Oxide
- Octet Rule
- Osmolarity
- Oligomer
- Organometallic
- Osmium
- Oxidizing Agent
- Oxoacid
- Oxyanion
- Oligosaccharide
- Osmotic Pressure
- Overpotential
- Oxygenation
- Oxytocin
- Ozone
- Orthophosphoric Acid
Biology Words That Start With O:
- Organ
- Organism
- Osmosis
- Ovary
- Ovum
- Omnivore
- Osteocyte
- Oxytocin
- Oogenesis
- Oncogene
- Operon
- Organelle
- Ornithology
- Oviparous
- Olfactory
- Ossification
- Oocyte
- Optic Nerve
- Osmoregulation
- Oropharynx
Math Words That Start With O:
- Obtuse Angle
- Octagon
- Odd Number
- Ordinal Number
- Orthogonal
- Outlier
- Overlapping Events
- Octahedron
- Operator
- Order of Operations
- Ordinate
- Origin
- Oscillating Sequence
- Optimization
- Orthant
- Outcome
- Outlier
- Oval
- Overall Probability
- Order
Physical Science Words With O:
- Oscillation
- Orbit
- Osmosis
- Oxidation
- Oxygen
- Ozone
- Octet Rule
- Opacity
- Orbital
- Osmotic Pressure
- Oxidation State
- Oxidizing Agent
- Ohmic
- Optical Lens
- Optoelectronics
- Ore
- Organic Molecule
- Osmolarity
- Outgassing
- Overpotential
- Oxide
- Oxyanion
- Oxyacid
- Oxidative Phosphorylation
- Ozone Depletion
Scientific Words With O:
- Organism
- Osmosis
- Oxygen
- Ozone
- Organ
- Orbit
- Optics
- Oxidation
- Ovary
- Ovum
- Omnivore
- Organic
- Oncogene
- Organelle
- Olfactory
- Ossification
- Osmoregulation
- Osteocyte
- Outlier
- Overlap
- Overpotential
- Oxidizing Agent
- Oxidative Stress
- Oviparous
- Otolith
Forensic Words with O:
- Odontology
- Offender Profiling
- Organic Analysis
- Overdose
- Oxidative Stress
- Ownership
- Olfactory Imprint
- Ossification
- Onset of Rigor Mortis
- Outsole Pattern
- Obliterated Serial Number
- Official Misconduct
- Oral Toxicity
- Opinion Testimony
- Optical Enhancement
- Out-of-Court Identification
- Overturn
- Overrule
- Overlapping Prints
- Offense
- Operational Range
- Oral Evidence
- Overkill
- Objective Test
- Outlying Fibers
Science Words with O and Their Meanings:
- Orbit: Path of a body around a celestial object.
- Osmosis: Movement of solvent through a semipermeable membrane.
- Organism: An individual animal, plant, or single-celled life form.
- Oxygen: Chemical element, essential for most life forms.
- Ozone: Triatomic form of oxygen, present in atmosphere.
- Omnivore: An animal or person that eats food of both plant and animal origin.
- Ovule: Plant structure that develops into a seed.
- Oxidation: Loss of electrons during a chemical reaction.
- Oligotrophic: Nutrient-poor but oxygen-rich water body.
- Optics: Study of light and vision.
- Oncology: Study and treatment of tumors.
- Osmium: A hard, brittle, blue-gray or blue-black metallic element.
- Orthopedics: Branch of medicine dealing with the musculoskeletal system.
- Oocyte: Cell in an ovary which may undergo meiotic division.
- Oligarchy: Power structure with few people in control.
- Ornithology: Study of birds.
- Ore: Naturally occurring solid material from which a metal can be extracted.
- Osmoregulation: Maintenance of constant osmotic pressure in fluids.
- Outcrop: Part of a rock formation exposed on the surface.
- Oviparous: Producing young by means of eggs.
- Osmolarity: Concentration of osmotically active particles in solution.
- Oscillation: Movement back and forth at a regular speed.
- Otolith: Small particle in the inner ear, that aids in balance.
- Obligate: Biologically essential for survival.
- Octet: Group of eight electrons in an atom.
- Oblate: Flattened at the poles (referring to celestial bodies).
- Osmium: Dense, blue-gray metal, often used in alloys.
- Oogenesis: Process of egg cell formation.
- Outgassing: Release of gas previously trapped, frozen, or absorbed.
- Ornamental: Pertaining to decorative or aesthetic purposes in nature.
