trimeter

This term is a technical descriptor used primarily in prosody and the study of classical poetry. It specifies a precise structural constraint on a line of verse, indicating that the line is composed of exactly three metrical feet. Because it is a specialized term of art, it is almost exclusively found in academic, literary, or poetic contexts rather than in general conversation.

In practice, trimeter is rarely used in isolation and is typically modified by the type of foot employed, such as dactylic or iambic trimeter. This allows the speaker to define both the rhythm and the length of the poetic line simultaneously.