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Antrum of Highmore

1. Pyramid shaped maxillary sinus that is the largest of the paranasal sinuses, and drains into the middle meatus of the nose. It is present at birth as rudimentary air cells, and develops throughout childhood. ( 2. A large, pyramidal in shape, air-filled paranasal sinus within the body of the maxilla, communicating with the middle meatus of the nose on the same side. ( Syn: maxillary antrum, maxillary sinus, Highmore’s...

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ˈā-nəs Noun 1. An opening at the opposite end of an animal’s digestive tract from the mouth. Its function is to control the expulsion of feces, unwanted semi-solid matter produced during digestion, which, depending on the type of animal, may include: matter which the animal cannot digest, such as bones; food material after all the nutrients have been extracted, for example cellulose or lignin; ingested matter which would be toxic if it remained in the digestive tract; and dead or excess gut bacteria and other endosymbionts. ( 2. The posterior opening of the alimentary canal. ( 3. (Anatomy) The lower opening of the alimentary canal, through which feces and flatus are ejected. (   Word origin: From Latin anus, meaning “ring, anus”, which is from the Proto-Indo-European ano–, meaning...

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Noun 1. The scientific study of spiders and related animals such as scorpions, pseudoscorpions, harvestmen, collectively called arachnids. 2. A branch of zoology that studies spiders and arachnids. (-Ologies & -Isms. Copyright 2008 The Gale Group, Inc.) Syn: arachnidology, araneology Word origin: from Greek ἀράχνη, arachnē (spider); and -λογία, -logia...

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