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Aperture ratio

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• Aperture synthesis

  (in radio astronomy) a technique that combines the inputs of a set of radio telescopes to obtain a greater resolution of images than is possible with a single member of the set. noun an array of radio telescopes used in radio astronomy to simulate a single large-aperture telescope. Some such instruments use movable dishes while […]

• Apetalous

  having no petals. Historical Examples Rivina, ri-vī′na, n. a genus of apetalous plants, the pokeweed family. Chambers’s Twentieth Century Dictionary (part 3 of 4: N-R) Various Our genera are apetalous and with the calyx free from the ovary. The Manual of the Botany of the Northern United States Asa Gray Stackhousia juncea, according to Clarke, […]

• Apex beat

  apex beat apex beat n. A pulsation, either visible or palpable or both, made by the apex of the left ventricle of the heart as it strikes the chest wall in systole. Historical Examples The position of the apex beat alone can not determine this, neither can the limit to the right of the sternum. […]

• Apex club

  noun (in Australia) an association of business and professional men founded to promote community welfare

• Apex pneumonia

  apex pneumonia apex pneumonia or apical pneumonia n. Pneumonia of the apex of the lung.

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