a-是什么意思,a-的解释 - 英汉词典

a-

汉语翻译pref. 不, 缺少, 无
【医】 不, 无, 缺; 离英语解释：名词 a-:

1. a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

   同义词：angstrom, angstrom unit, A

2. any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

   同义词：vitamin A, antiophthalmic factor, axerophthol, A

3. one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)

   同义词：deoxyadenosine monophosphate, A

4. (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

   同义词：adenine, A

5. the basic unit of electric current adopted under the Systeme International d"Unites

   同义词：ampere, amp, A

6. the 1st letter of the Roman alphabet

   同义词：A, letter a

7. the blood group whose red cells carry the A antigen

   同义词：A, type A, group A