Definify.com
Webster 1913 Edition
Promiser
Prom′is-er
,Noun.
One who promises.
Webster 1828 Edition
Promiser
PROM'ISER
,Noun.
The import of a promise, when disputed, is not to be determined by the sense of the promiser, nor by the expectations of the promisee.
[Note. In law language, promisor is used, but without necessity or advantage.]