IPA: /ˈtɛtrəˌmɛtər/
KK: /tɛtˈræmɪtər/
A type of line in poetry that has four groups of beats or feet, often used in various styles of verse.
The poem was written in tetrameter, giving it a rhythmic and flowing quality.
Tetrameter → It is formed from "tetra-" (from Greek "tetra", meaning four) and "metron" (meaning measure). The word "tetrameter" refers to a line of verse consisting of four metrical feet, hence a measure of four.
Think of 'four' ('tetra-') as the number of metrical feet in a line, which helps you remember that a tetrameter is a line with four measures.