* Dactylic refers to the metrical foot, which consists of one stressed syllable followed by two unstressed syllables (e.g., "Dac-ty-lic").
* Dimeter means two feet per line.
* Trimeter means three feet per line.
Therefore, dactylic dimeter has two dactylic feet per line (6 syllables total), and dactylic trimeter has three dactylic feet per line (9 syllables total).
These meters are not as common as other meters like iambic pentameter, but they can be found in certain forms of poetry and in specific lines within longer poems.