a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals
limewater
Noun
solution of calcium hydroxide in water used as an antacid
lactase
Noun
any of a group of enzymes (trade name Lactaid) that hydrolyze lactose to glucose and galactose
lactic acid
Noun
a clear odorless hygroscopic syrupy carboxylic acid found in sour milk and in many fruits
lactifuge
Noun
any agent that reduces milk secretion (as given to a woman who is not breast feeding)
lactogen
Noun
any agent that enhances milk production
lactose
Noun
a sugar comprising one glucose molecule linked to a galactose molecule
lamellar mixture
Noun
a mixture in which substances occur in distinct layers
lapis lazuli
Noun
an azure blue semiprecious stone
lazuli
Noun
an azure blue semiprecious stone
lard oil
Noun
oil consisting chiefly of olein that is expressed from lard and used especially as a lubricant, cutting oil or illuminant
larvicide
Noun
a chemical used to kill larval pests
laterite
Noun
a red soil produced by rock decay
lath and plaster
Noun
a building material consisting of thin strips of wood that provide a foundation for a coat of plaster
lauric acid
Noun
a crystalline fatty acid occurring as glycerides in natural fats and oils (especially coconut oil and palm-kernel oil)
lauryl alcohol
Noun
a colorless insoluble solid alcohol used to make detergents and pharmaceuticals
latten
Noun
brass (or a yellow alloy resembling brass) that was hammered into thin sheets
lava
Noun
rock that in its molten form, known as magma, issues from volcanos
limonene
Noun
a liquid terpene with a lemon odor
limonite
Noun
a widely occurring iron oxide ore
linoleic acid
Noun
a liquid polyunsaturated fatty acid abundant in plant fats and oils
linolic acid
Noun
a liquid polyunsaturated fatty acid abundant in plant fats and oils
linolenic acid
Noun
a liquid polyunsaturated fatty acid that occurs in some plant oils
linoleum
Noun
a floor covering
lino
Noun
a floor covering
linuron
Noun
a herbicide that kills weeds without harming vegetables
lipase
Noun
an enzyme secreted in the digestive tract that catalyzes the breakdown of fats into individual fatty acids that can be absorbed into the bloodstream
lipid
Noun
an oily organic compound insoluble in water but soluble in organic solvents
lipide
Noun
an oily organic compound insoluble in water but soluble in organic solvents
lipoid
Noun
an oily organic compound insoluble in water but soluble in organic solvents
lipoprotein
Noun
a conjugated protein having a lipid component
liquid nitrogen
Noun
nitrogen in a liquid state
liquid air
Noun
air in a liquid state
liquid bleach
Noun
a solution containing bleaching agents
liquid crystal
Noun
a liquid exhibiting properties of a crystal that are not shown by ordinary liquids
litmus
Noun
a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions
litmus paper
Noun
unsized paper treated with litmus for use as an acid-base indicator
lithia water
Noun
mineral water containing lithium salts
lithium carbonate
Noun
a white powder (LiCO3) used in manufacturing glass and ceramics and as a drug
loam
Noun
a rich soil consisting of a mixture of sand and clay and decaying organic materials
low-carbon steel
Noun
steel with less than 0.15% carbon
lodestone
Noun
a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted magnetically
loadstone
Noun
a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted magnetically
loess
Noun
a fine-grained unstratified accumulation of clay and silt deposited by the wind
low brass
Noun
brass with 30% or less zinc
low-density lipoprotein
Noun
a lipoprotein that transports cholesterol in the blood
low-level radioactive waste
Noun
(medicine) radioactive waste consisting of objects that have been briefly exposed to radioactivity (as in certain medical tests)
lye
Noun
a strong solution of sodium or potassium hydroxide
lymphokine
Noun
a cytokine secreted by helper T cells in response to stimulation by antigens and that acts on other cells of the immune system (as by activating macrophages)