Biology Dictionary

  • Orthopnea

    Orthopnea

    A condition in which a person has difficulty breathing when lying flat, often associated with heart or lung diseases.

  • Orthoptera

    Orthoptera

    An order of insects that includes grasshoppers, crickets, and locusts, characterized by powerful hind legs for jumping.

  • Oryza sativa

    Oryza sativa

    The scientific name for the domesticated rice plant, one of the most important food crops worldwide.

  • Osculum

    Osculum

    An opening in certain aquatic animals, such as sponges, through which water enters or exits.

  • Osmoregulation

    Osmoregulation

    The process by which organisms regulate the balance of water and salts in their bodies to maintain homeostasis.

  • Osmosis

    Osmosis

    The movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area…

  • Osmotic pressure

    Osmotic pressure

    The pressure required to prevent the flow of water through a semipermeable membrane due to osmosis.

  • Osphresiology

    Osphresiology

    The study of the sense of smell.

  • Orchis

    Orchis

    A genus of flowering plants in the family Orchidaceae, often known for their beautiful and intricate flowers.

  • Order in taxonomy

    Order in taxonomy

    A taxonomic rank used in the biological classification of organisms, below class and above family.