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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.
agar a gelatinous substance derived from red marine algae, used esp. to solidify bacterial cultures and to thicken foods; agar-agar.
aloe any of a genus of mostly African plants that have thick, jagged leaves and bear red or yellow flowers. [1/2 definitions]
amaranth a plant having coarse leaves and bearing purple, green, or red clusters of small flowers, often grown as a food crop. [2/3 definitions]
American Beauty a type of hybrid rose that bears long-stemmed red flowers.
anemia a condition resulting from a deficiency of red blood cells or hemoglobin and characterized by weakness, pallor, and difficulty in breathing.
anemic pertaining to or suffering from anemia, a condition resulting from a deficiency of red blood cells or hemoglobin and characterized by weakness, pallor, and difficulty in breathing. [1/2 definitions]
anemone a type of plant related to the buttercup and characterized by large white, blue, purple, or red flowers. [1/2 definitions]
Antares a red binary star in the constellation Scorpius, having a combined magnitude of 1.0.
anthocyanin any of a group of plant pigments ranging in color from red to blue.
apple a firm round fruit with succulent white flesh and a red, green, or yellow skin. [1/3 definitions]
Arabia a Southwest Asian peninsula between the Red Sea and the Persian Gulf.
Arabian Peninsula a peninsula in western Asia that lies between the Red Sea to the west and the Persian Gulf to the northeast. The Indian Ocean borders the Arabian Peninsula on the southeast. Countries located on the peninsula include Saudi Arabia, Yemen, Oman, United Arab Emirates, Qatar, Bahrain, and Kuwait.
areca any of several tall palm trees of tropical Asia, such as the betel palm, having a smooth, slender trunk and feathery leaves and bearing red or orange nuts. [1/2 definitions]
Asia a large continent in the Eastern Hemisphere, bounded by the Arctic, Pacific, and Indian Oceans, the Red Sea, and eastern Europe.
astilbe any plant of the genus Astilbe, having small red, white, or pink flowers.
aucuba an Asian evergreen shrub of the dogwood family that has variegated leaves and bears red berries.
azobenzene an orange-red, nonsoluble crystalline compound obtained from nitrobenzene, used in organic synthesis, as an insecticide, and in the making of dyes.
balata a tropical American tree with dark red wood that yields a latex sap. [1/2 definitions]
baneberry a plant of the buttercup family that bears white flowers and fleshy poisonous red or white berries. [1/2 definitions]
barber pole a pole or cylinder with red and white spiral stripes, by which barbers indicate the location of their shops.