Final answer:
The line 'The hand that held my wrist' from 'My Papa's Waltz' employs iambic trimeter, a meter with three iambic feet per line, contributing to the poem's waltz-like rhythm.
Step-by-step explanation:
In "My Papa's Waltz," the line 'The hand that held my wrist' is written in iambic trimeter. This is a poetic meter that consists of three iambic feet per line. An iamb features an unstressed syllable followed by a stressed syllable, as is found in the words 'my wrist' in this particular line. The rhythm and meter of this line contribute to the overall waltz-like cadence of the poem, which is significant in conveying the dance between the father and child, as well as the underlying emotional complexity suggested by the dual interpretations of playfulness and disquiet.