DictionaryiambPoetic rhythm unit
noun

iamb

EYE-am/ˈaɪæm/

A metrical foot consisting of an unstressed syllable followed by a stressed syllable.

An iamb moves from the unstressed “a” to the stressed “WAY.”

A poetry card displays exactly "a WAY" with small light first syllable and bold dark second syllable; one rising rhythmic pair, no extra text.
Etymology

Greek iambos named a metrical unit measured by syllable length. English poets adapted the ancient term to stress, yielding the familiar unstressed-then-stressed foot.

In context

OSU School of Writing, Literature and Film1:51
The repeating unit here is one unstressed syllable and one stressed syllable. This type of metrical foot is called an iamb and there are five of them here.
"What is Meter in Poetry?": A Literary Guide for English Students and Teachers

More examples

  • The word “believe” is an iamb.
  • Five iambs make up a line of iambic pentameter.
  • Read each iamb with a light beat followed by a strong beat.

Forms

iamb · iambs

iambic adjective — Written in or characterized by iambs.

Similar words

iambic foot
Names the same rhythm while explicitly identifying the metrical unit.