Monometer

In poetry, a monometer is a line of verse with just one metrical foot, exemplified by this portion of Herrick's "Upon His Departure Hence":

Thus I
Passe by,
And die:
As one,
Unknown,
And gone.

I looked upon the rotting sea, 
And drew my eyes away;
I looked upon the rotting deck,
And there the dead men lay.I looked upon the rotting sea, 
And drew my eyes away;
I looked upon the rotting deck,
And there the dead men lay.I looked upon the rotting sea, 
And drew my eyes away;
I looked upon the rotting deck,
And there the dead men lay.