Cytosine
Part of speech: noun
Definition: A base, C4H5N3O, which pairs with guanine in DNA and RNA.
C
Part of speech: symbol
Definition: The letter cee, the third letter of the English alphabet.
Part of speech: abbreviation
Definition:
Part of speech: noun
Definition: The middle tone in either one of the sets of seven white keys on a keyboard or a set of seven strings on a stringed instrument.