Biology Dictionary

  • Pleistocene

    Pleistocene

    A geological epoch lasting from about 2.6 million to 11,700 years ago, characterized by repeated glaciations and the evolution of…

  • Pleura (pl. pleurae)

    Pleura (pl. pleurae)

    The double-layered membrane surrounding the lungs and lining the chest cavity.

  • Pleural

    Pleural

    Relating to the pleura, the membrane surrounding the lungs.

  • Pleural cavity

    Pleural cavity

    The space between the two layers of the pleura, containing a small amount of fluid that reduces friction during breathing.

  • Pliocene

    Pliocene

    A geological epoch lasting from about 5.3 to 2.6 million years ago, marked by the appearance of early human ancestors…

  • Ploidy

    Ploidy

    The number of sets of chromosomes in a cell, with diploid organisms having two sets and haploid organisms having one.

  • PLP

    PLP

    Abbreviation for pyridoxal phosphate, the active form of vitamin B6, involved in amino acid metabolism.

  • Pluripotency

    Pluripotency

    The ability of a stem cell to differentiate into any type of cell in the body, except for extra-embryonic tissues.

  • PM

    PM

    Abbreviation for post-mortem, or the examination of a body after death, often used in medical and forensic contexts.

  • Pneograph

    Pneograph

    An instrument used to record respiratory patterns or lung function.