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Latex: A white sticky fluid that flows from the cut surfaces of some plants.
Lava: Molten rock, or magma, that has been exposed at the Earth's surface, sometimes through a volcanic eruption.
Leukocyte: A type of white blood cell that is filled with enzymes that digest microorganisms, such as bacteria.
Light year: The distance light travels in one year. Light travels at a rate of about 300 million meters per second, and there are about 3.156*107 seconds in a year, which is a distance of about 9.4681015meters. (If you're unfamiliar with distance in meters, one meter is about 3.28 feet. That means light travels about 3.11*1016 feet in one year!)
Lignicolous: A term that refers to any type of fungi that lives on, and eats wood.
Lignin: An organic polymer that is used to bind the cellulose fibers in wood helps strenghten cell walls.
Lipid: A fatty, oily, or waxy substance that is typically insoluble in water, but can be soluble in other organic compounds
 Lithosphere: In geology, the name for the outer, rocky part of the Earth, also refered to as the crust.
Image can be found at Classroom@Sea: The Carlsberg Ridge Cruise.
Lymph node: A round mass of lymphatic tissue which filters lymphatic fluid.
Lymphatic fluid: Also known simply as lymph. A clear fluid that carries lymphocytes to help fight infection.
Lymphatic tissue: Tissue in the body that helps the immune system fight infection.
Lymphocyte: A non-granular leukocyte that can be found in lymphatic tissue (e.g. the lymph nodes) which aids in immune response by producing antibodies.
Lytic: A term referring to anything that has the ability to destroy a cell by rupturing its plasma membrane.
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