Category: L

  • Layer of rods and cones

    The layer of the retina of the eye next to the pigment layer. It contains the rods and cones.  

  • Laxity

    The amount a joint or ligament deviates from its initial position when a force is applied to it.  

  • Laxative regimen

    A diet modified to avoid chronic constipation by eating high bulk foods that contain a high fiber content, eating foods that tend to stimulate bowel activity (e.g., stewed fruits and vegetables), maintaining adequate fluid intake, and participating in regular exercise.  

  • Lawrencium

    A synthetic transuranic chemical element; atomic weight of the most stable isotope is 260; atomic number is 103.  

  • Lawn

    A layer of microorganisms growing on a culture medium.  

  • Law of reciprocal proportions

    In chemistry, the proportions in which two elementary bodies unite with a third one are simple multiples or simple fractions of the proportions in which these two bodies unite with each other.  

  • Law of multiple proportions

    When two substances unite to form a series of chemical compounds, the proportions in which they unite are simple multiples of one another or of one common proportion.  

  • Law of mass action

    In any chemical reaction, the law that states that the ratio of the mathematical products of the  concentrations of the products to the mathematical products of the concentrations of the reactants is constant at a given temperature.  

  • Law of definite proportions

    Two or more elements when united to form a new substance do so in a constant and fixed proportion by weight.  

  • Laurence-Moon-Biedl syndrome

    The combination of girdle-type obesity, sexual underdevelopment, mental retardation, retinal degeneration, polydactyly, and deformity of the skull. The condition is inherited as an autosomal recessive trait. A rare genetic condition marked by obesity, retinal degeneration which can result in blindness, intellectual challenges, the presence of extra fingers or toes, and reduced function of the ovaries…