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| ABO system |
a classification system for the inherited antigens found on the surface of human red blood cells, which determine compatibility for blood transfusions. |
| abound |
to be found or available in a large amount or number. [1/2 definitions] |
| adder2 |
a small poisonous snake found in Europe and Asia; viper. [1/2 definitions] |
| adenosine |
an organic compound that is made up of adenine and ribose and found in nucleic acids, and that may be obtained as a white crystalline powder through the hydrolysis of yeast. |
| admiral |
any of a family of brightly colored, medium to large-sized butterflies, found worldwide. [1/2 definitions] |
| agouti |
any of several related nocturnal, burrowing rodents found in the tropics of the Western Hemisphere that are about the size of a rabbit but have short ears and grizzled fur. |
| alanine |
a nonessential amino acid that is found in proteins. |
| albacore |
a variety of tuna found in warm to temperate waters, and often canned for human consumption. |
| albatross |
any of several of the largest seabirds, with webbed feet, long narrow wings, and hooked beaks, that are found chiefly in the Southern Hemisphere. |
| albumin |
any of a class of proteins soluble in water and coagulating in heat, found in egg white, blood, milk, and various plant and animal tissues. |
| alewife1 |
a small fish, related to the herring and resembling the shad, found in North America in the Atlantic Ocean and the Great Lakes. |
| alkali |
a soluble salt found in some soil composition, making it unfit for agriculture. [1/2 definitions] |
| alkaloid |
any of various nitrogen-containing organic bases found in plants and from which drugs such as nicotine, quinine, and morphine are made. |
| alligator |
either of two large crocodilian reptiles found in China and the southeastern United States and distinguished by their short broad snouts. |
| altocumulus |
a cloud having rounded, fluffy edges and a white or gray color, found at medium altitudes. |
| altostratus |
a thick dense cloud that forms a uniform gray sheet that often produces precipitation, found at medium altitudes. |
| ament1 |
a dense, drooping cluster of scalelike flowers growing around a spike, found on trees such as poplars, birches, and willows; catkin. |
| amylase |
any of a class of enzymes, found in saliva and many tissues of plants and animals, that break down starch to sugars. |
| anchovy |
any of various small, herringlike fish, used for food and found in the Mediterranean Sea. |
| Aphrodite |
(l.c.) a large brown butterfly with silvery spots, found in North America. [1/2 definitions] |
| arginine |
an amino acid found in most proteins that is essential in the human diet. |
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