Definition: the 21st letter of the Roman alphabet
Similar words: alphabetic character, letter, letter of the alphabet
Definition: the conventional characters of the alphabet used to represent speech
Usage: his grandmother taught him his letters
Synonyms: U, uranium, atomic number 92
Definition: a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
Similar words: metal, metallic element
Definition: any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
Definition: a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
Similar words: nucleotide, base
Definition: a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)
Synonyms: u
Definition: (chiefly British) of or appropriate to the upper classes especially in language use
Similar words: upper-class
Definition: occupying the highest socioeconomic position in a society