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Sievers

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• Sievert

  noun, Physics. 1. the standard unit in the International System of Units (SI) of dose equivalent having the same biological effect as one joule of x-rays per kilogram of recipient mass (or one gray): The average person receives about 2 to 3 one-thousandths of a sievert per year from naturally occurring radiation in the environment. […]

• Sieve-tube

  noun, Botany. 1. a vertical series of sieve cells in the phloem, specialized for the conduction of food materials. 2. a single sieve cell. noun 1. (botany) an element of phloem tissue consisting of a longitudinal row of thin-walled elongated cells with perforations in their connecting walls through which food materials pass

• Sieve-tube element

  sieve-tube element An elongated, food-conducting cell in phloem in angiosperms. Unlike the tracheary elements of xylem, sieve elements have living protoplasts when mature, but they lack a nucleus and are dependent upon companion cells for certain functions. At the ends of each sieve-tube element are sieve plates, areas of the cell wall containing numerous large […]

• Sieving

  noun 1. an instrument with a meshed or perforated bottom, used for separating coarse from fine parts of loose matter, for straining liquids, etc., especially one with a circular frame and fine meshes or perforations. 2. a person who cannot keep a secret. verb (used with or without object), sieved, sieving. 3. to put or […]

• Sif

  adjective 1. (South African, slang) disgusting; sickening; nasty SIF somatotropin release-inhibiting factor

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