A pyrrhic is a metrical foot used in formal poetry. It consists of two unaccented, short syllables. It is also known as a dibrach.
Tennyson used pyrrhics and spondees quite frequently. Here are some examples:
- Be near me when my light is low,
- When the blood creeps and the nerves prick
- And tingle; and the heart is sick,
- And all the wheels of Being slow.
- -from In Memoriam.
Examples above include "When the" and "and the" in the second line and "-le; and" in the third.
Pyrrhics alone are not used to construct an entire poem due to the monotonous effect.