the GNU version of the Collaborative International Dictionary of English
ad. In a metrical manner.
The Century Dictionary and Cyclopedia
In a metrical manner; measuredly; as regards meter.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. with regard to meter
Word Usage
"Naming a town "Haag" would just be odd, as it needs an article (compare a town named "Hedge" in English speaking countries) and the single syllable is metrically awkward as well."