iambuses

Parisyllabic verse should regularly be composed of all iambuses; that is to say, all its even syllables should be accented.

Miscellany

Thus we have learned to scan lines by iambuses, or rather by their accentual imitations, and a perfect line would consist of ten syllables, of which the alternate ones bore a rhythmical stress.

The Works of William Shakespeare [Cambridge Edition] [9 vols.] Introduction and Publisher's Advertising

These iambuses may, under certain restrictions, be changed for 'trochees,' and out of these two 'feet,' or their representatives, a metre, certainly very beautiful, has grown up gradually, which attained perhaps its greatest perfection in the verse of Pope.

The Works of William Shakespeare [Cambridge Edition] [9 vols.] Introduction and Publisher's Advertising