1. A

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.
Synonyms
nm millimicron angstrom unit picometer micromicron angstrom nanometer micromillimeter picometre metric linear unit nanometre micromillimetre
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2. A-bomb

noun. A nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239).
Synonyms
atom bomb plutonium bomb bomb nuclear weapon clean bomb dirty bomb plutonium trigger plutonium pit fission bomb atomic weapon neutron bomb atomic bomb
Antonyms
dumb bomb smart bomb defend pass

3. bric-a-brac

noun. Miscellaneous curios.
Synonyms
curio whatnot oddity curiosity knickknackery oddment nicknack peculiarity knickknack rarity
Antonyms
familiarity commonality abundance

4. A

noun. The 1st letter of the Roman alphabet.
Synonyms
Roman alphabet alphabetic character letter a letter of the alphabet Latin alphabet
Antonyms
genuine legitimate right superior

5. A

noun. The basic unit of electric current adopted under the Systeme International d'Unites.
Synonyms
amp current unit milliampere ampere abamp abampere mA

6. a

noun. (ə, ˈeɪ) The 1st letter of the Roman alphabet.
Synonyms
Roman alphabet alphabetic character letter A letter of the alphabet Latin alphabet
Etymology
a (English)
a (Middle English (1100-1500))

7. A

noun. One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose).
Synonyms
deoxyadenosine monophosphate nucleotide base

8. A

noun. The blood group whose red cells carry the A antigen.
Synonyms
blood type blood group group A type A
Antonyms
exon intron outfield noble incidental

9. A

noun. Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes.
Synonyms
fat-soluble vitamin vitamin A1 vitamin A vitamin A2 dehydroretinol retinol axerophthol antiophthalmic factor

10. A

noun. (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA.
Synonyms
DNA desoxyribonucleic acid deoxyribonucleic acid adenine purine ribonucleic acid RNA
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