A (Noun)

Meaning 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.

Classification

Nouns denoting quantities and units of measure.

Synonyms

• Angstrom
• Angstrom Unit

Hypernyms

• Metric Linear Unit

Meaning ²

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

Classification

Nouns denoting substances.

Synonyms

• Vitamin A
• Axerophthol
• Antiophthalmic Factor

Hypernyms

• Fat-soluble Vitamin

Hyponyms

• Retinol
• Vitamin A1
• Vitamin A2
• Dehydroretinol

Meaning ³

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.

Synonyms

• Ampere
• Amp

Hypernyms

• Current Unit

Meaning ⁴

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

Classification

Nouns denoting substances.

Synonyms

• Adenine

Hypernyms

• Purine

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.

Synonyms

• Deoxyadenosine Monophosphate

Hypernyms

• Nucleotide

Meaning ⁶

The 1st letter of the Roman alphabet.

Classification

Nouns denoting communicative processes and contents.

Synonyms

• A

Hypernyms

• Alphabetic Character
• Letter Of The Alphabet

Meaning ⁷

The blood group whose red cells carry the A antigen.

Classification

Nouns denoting body parts.

Synonyms

• Type A
• Group A

Hypernyms

• Blood Type