A (Noun)
Meaning 1
The blood group whose red cells carry the A antigen.
Classification
Nouns denoting body parts.
Examples
- The patient's blood type was A positive, meaning she had the A antigen on her red blood cells.
- Individuals with A blood type can receive blood from A or O donors, but not from B or AB donors.
- The A antigen is present on the surface of red blood cells in people with A blood type.
- A person with A negative blood type has the A antigen on their red cells but lacks the RhD antigen.
- The ABO blood group system categorizes blood into four main types: A, B, AB, and O.
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Meaning 2
A metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation.
Classification
Nouns denoting quantities and units of measure.
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Meaning 3
The 1st letter of the Roman alphabet.
Classification
Nouns denoting communicative processes and contents.
Examples
- The teacher asked the student to write the letter a on the blackboard.
- The first letter of the word "apple" is a.
- The alphabet song starts with the line "a is for apple".
- In the Roman alphabet, a is the first letter.
- The lowercase version of the letter a is a common letter in many words.
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Meaning 4
Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes.
Classification
Nouns denoting substances.
Examples
- Carrots are a good source of vitamin A which helps prevent night blindness and promote healthy vision.
- People with a diet low in vitamin A may be at risk for impaired vision or night blindness.
- Taking vitamin A supplements has been shown to improve eyesight and prevent age-related macular degeneration.
- Retinol, a type of vitamin A, helps regenerate the pigment in the retina, ensuring optimal eye function.
- Fortified cereals are a popular way to boost intake of essential vitamins and minerals, including vitamin A.
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Meaning 5
One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose).
Classification
Nouns denoting substances.
Examples
- The nucleotide adenine, abbreviated as A, is one of the four nucleotides used in building DNA.
- In DNA, the nucleotide A is paired with thymine, while in RNA, A is paired with uracil.
- The nucleotide A is composed of a phosphate group, a sugar molecule called ribose, and the nitrogenous base adenine.
- The sequence of A, C, G, and T nucleotides determines the genetic information encoded in DNA.
- The nucleotide A is an essential component of DNA and RNA, playing a crucial role in the transmission of genetic information.
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Meaning 6
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA.
Classification
Nouns denoting substances.
Examples
- Researchers extract samples rich in base composition includeings millions adenines strands entangling further chromosomes inspection aims specifically cellular functioning heliological view organisms general spectrum basis determining environmental inheritance complex series bases other hermonic matter basically double each protein determining triple process requiring larger order pairing phosphordelecrady patterns encoding subsequent form systems natural necessity elements various wide micro based order genome formed typically less variety variations having fundamental pairing necessary specificity typical number naturally selecting everything codes providing significant huge required both evolution needed mainly possible reasons considered closely regulated structures conditions strongly holding some relative whole strands under differing structural shapes turning themselves controlling pur nucle including properties together simply order change made turning organisms especially creating.
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Meaning 7
The basic unit of electric current adopted under the Systeme International d'Unites; "a typical household circuit carries 15 to 50 amps".
Classification
Nouns denoting quantities and units of measure.
Examples
- A typical household circuit carries 15 to 50 amps, while larger industrial equipment can draw many hundreds of amps.
- To ensure safe usage, a meter must be calibrated to read in amps and ohms, or a ratio of voltage to current.
- Generators producing multiple-phase electric currents will require sophisticated electrical panel layouts with balanced loads of several hundred amps.
- Any resistance less than an amp poses the danger of accidental arcing of hot, non-isolated voltage levels across normal use space or time scales.
- Small variable capacitors built from silver-disk tuners control ten, sometimes a dozen millivolts from sixty hertz all up to eight millamps of usable regulated d c flow within reasonable system integration techniques