Which literary term refers to a single line of poetry?

The term that refers to a single line of poetry is "verse." In poetry, the use of the word "verse" typically denotes an individual line that contributes to the overall structure and rhythm of the poem. Each line, or verse, can have its own distinct meaning and can be crafted to enhance the imagery, emotion, and sound of the poem.

While "stanza" refers to a grouped set of lines in a poem, "couplet" specifically indicates a pair of consecutive lines that usually rhyme, and "quatrain" is a stanza consisting of four lines. Therefore, the choice of "verse" distinctly identifies the single line as a standalone element within the broader context of poetry.