| 1. |
(noun) the blood group whose red cells carry the A antigen |
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Synonyms: group A, type A |
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Related Words: blood group, blood type |
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| 2. |
(noun) the basic unit of electric current adopted under the System International d'Unites; "a typical household circuit carries 15 to 50 amps" |
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Synonyms: amp, ampere |
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Related Words: current unit |
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| 3. |
(noun) a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation |
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Synonyms: angstrom, angstrom unit |
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Related Words: metric linear unit |
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| 4. |
(noun) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes |
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Synonyms: antiophthalmic factor, axerophthol, vitamin A |
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Related Words: dehydroretinol, fat-soluble vitamin, retinol, vitamin A1, vitamin A2 |
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