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Open Abdomen

In vertebrates, the part of the body below the thorax , containing the digestive organs; in insects and other arthropods, it is the hind part of the

Open Abortion

Worldwide, some 46 million women have abortions every year. Of these abortions, only slightly more than half are legal, that is, take place under

Open Absorption

In physics, taking up of matter or energy of one substance by another, such as a liquid by a solid (ink by blotting paper) or a gas by a liquid


( Әkā'shӘ ), any plant of the large leguminous genus Acacia, often thorny shrubs and trees of the family Leguminosae ( pulse family). Chiefly of the

Açaí palm

( ä´´säē' ), tree, Euterpe oleracea, of the family Arecaceae ( palm family) and its fruit, grown chiefly in Pará state in the Amazon region of Brazil.

Open Acanthocephala

Abstract The Acanthocephala or thorny-headed worms constitute a group of about 1100 species of endoparasites. Sexual maturity occurs in the gut of a

Open Acceleration (Mechanics)
Acceleration (Mechanics)

change in the velocity of a body with respect to time. Since velocity is a vector quantity, involving both magnitude and direction, acceleration is

Open Acid rain
Acid rain

Acidic precipitation thought to be caused mainly by the release into the atmosphere of sulphur dioxide (SO 2 ) and oxides of nitrogen (NO x ), which

Open Acids

In chemistry, compound that releases hydrogen ions (H + or protons) in the presence of an ionizing solvent (usually water). Acids react with bases to

Open Acne

Skin eruption, mainly occurring among adolescents and young adults, caused by inflammation of the sebaceous glands , which secrete an oily substance