English dictionary · noun

oxygen

The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. Sometimes called elemental oxygen to distinguish it from molecular oxygen.

Meaning and definitions

1. The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. Sometimes called elemental oxygen to distinguish it from molecular oxygen.
2. Molecular oxygen (O₂), a colorless, odorless gas at room temperature.
3. A mixture of oxygen and other gases, administered to a patient to help them breathe.

Connected roots

• gen-

  birth, origin, kind

Explore the word family

These words share a recorded root connection. A shared root is a learning clue; it does not establish every step in a word’s history.

• genetic

  Relating to genetics or genes.

• hydrogen

  a colorless, odorless gas that is the lightest chemical element

• genesis

  the origin or mode of formation of something

• nitrogen

  The chemical element (symbol N) with an atomic number of 7 and atomic weight of 14.0067. It is a colorless and odorless gas.

• estrogen

  Any of a group of steroids that are secreted by the ovaries and function as female sex hormones.

• genealogy

  a line of descent traced from an ancestor

• homogeneous

  of the same kind; uniform in composition

• pathogen

  An agent that can cause disease, especially an infectious microorganism, such as a bacterium, virus, protozoon or fungus.

• heterogeneous

  diverse in character or content

• pathogenesis

  The origin and development of a disease.

• gonorrhea

  A sexually transmitted infection caused by Neisseria gonorrhoeae, a species of bacteria (the gonococcus) that affects the mucous membrane of the genital and urinary tracts.

• allergen

  A substance which causes an allergic reaction.

• phylogeny

  The evolutionary history of groups of organisms, such as species or clades.

• biogenesis

  The principle that living organisms are produced only from other living organisms.

• morphogenesis

  The differentiation of tissues and subsequent growth of structures in an organism

• orogeny

  The process of mountain building by the upward folding of the Earth's crust.

• allogeneic

  Genetically different because of being derived from separate individuals of the same species.

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