Dictionary Results for a


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

Synonym(s): angstrom, angstrom_unit, A

Hypernym(s): metric_linear_unit




2. a - noun

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

Synonym(s): vitamin_A, antiophthalmic_factor, axerophthol, A

Hypernym(s): fat-soluble_vitamin




3. a - noun

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

Synonym(s): deoxyadenosine_monophosphate, A

Hypernym(s): nucleotide, base




4. a - noun

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

Synonym(s): adenine, A

Hypernym(s): purine




5. a - noun

· the basic unit of electric current adopted under the Systeme International d'Unites; "a typical household circuit carries 15 to 50 amps"

Synonym(s): ampere, amp, A

Hypernym(s): current_unit




6. a - noun

· the 1st letter of the Roman alphabet

Synonym(s): A

Hypernym(s): letter, letter_of_the_alphabet, alphabetic_character




7. a - noun

· the blood group whose red cells carry the A antigen

Synonym(s): A, type_A, group_A

Hypernym(s): blood_group, blood_type





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