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Possible definitions for paar

pear
Any of several species of trees of the genus Pyrus, especially P. communis, of the rose family, which is one of the most important fruit trees in the world and is cultivated in all temperate-zone countries of both hemispheres. The thousands of varieties include Bartlett (by far the most widely grown), Beurre Bosc, and Beurre d'Anjou. In the U.S., much of the crop is canned; in Europe, pears are more commonly eaten fresh or used for perry (fermented pear juice). The tree is taller and more upright than the apple tree; pear fruits are sweeter and softer than apples. Hard cells (grit, or stone cells) dot the flesh.


pearl
Concretion formed by a mollusk consisting of the same material (called nacre, or mother-of-pearl) as the mollusk's shell. Long treasured as gemstones, pearls are valued for their translucence and luster and for the delicate play of surface color. The more perfect a pearl's shape and the deeper its luster, the greater its value. The color varies with the mollusk and its environment. Jewelers of the 16th-17th cent. often used irregularly shaped "baroque" pearls, formed from muscular tissue, to form the bodies of animals and other figures. In Europe and China, mother-of-pearl has been used as an inlay material for decorating furniture. The discovery that a pearl could be cultivated by insertion of a foreign object inside the mollusk's shell is said to have been made in 13th-cent. China.


agaric
Any fungus of the family Agaricaceae, incl. the familiar commercially grown mushroom. Agarics have spore-bearing cells (basidia) located on thin sheets called gills. Best known of the agarics is the genus Agaricus (Psalliota), which includes some 60 species, the most prominent being the edible meadow or field mushroom, A. campestris, and the common cultivated mushroom, A. bisporus.


air
Mixture of gases constituting the earth's atmosphere. Some gases occur in steady concentrations. The most important are molecular nitrogen (N2), 78% by volume, and molecular oxygen (O2), 21%. Small amounts of argon (Ar; 1.9%), neon (Ne), helium (He), methane (CH4), krypton (Kr), hydrogen (H2), nitrous oxide (N2O), and xenon (Xe) are also present in almost constant proportions. Other gases occur in variable concentrations: water vapor (H2O), ozone (O3), carbon dioxide (CO2), sulfur dioxide (SO2), and nitrogen dioxide (NO2). Air also contains trace amounts of ammonia and hydrogen sulfide. The variable constituents are important for maintaining life. Water vapor is the source for all forms of precipitation and is an important absorber and emitter of infrared radiation. Carbon dioxide is necessary for photosynthesis and is also an important absorber and emitter of infrared radiation. Ozone in the stratosphere (see ozone layer) is an effective absorber of ultraviolet radiation from the sun, but at ground-level is a corrosive pollutant and a major constituent of ...

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