Grandsire Definition
 grăndsīr, grăn- 
    noun
  
 The male grandparent of an animal, especially a domesticated animal such as a horse.
 American Heritage 
A grandfather.
 Webster's New World 
A male ancestor.
 Webster's New World 
An old man.
 Webster's New World 
Wiktionary 
Other Word Forms of Grandsire
Noun
Singular:
 grandsirePlural:
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