five-seven syllable meter
Refers to the traditional Japanese poetic meter based on alternating lines of five and seven syllables, as used in waka and other classical forms.
Waka poetry is fundamentally based on the five-seven syllable meter.
This poem is written in five-seven syllable meter.
Compound of 五 (go, 'five'), 七 (shichi, 'seven'), and 調 (chō, 'tone' or 'meter'). The term directly describes the alternating syllable pattern.