noun.
A taxonomic subdivision of a species consisting of an interbreeding, usually geographically isolated population of organisms.
The Century Dictionary and Cyclopedia
noun.
In zoology and botany, a variety of a species; a climatic or geographical race recognizably different from another, yet not specifically distinguished; a conspecies.
the GNU version of the Collaborative International Dictionary of English
noun.
A group somewhat lessdistinct than speciesusually are, but based on characters more important than those which characterize ordinary varieties; often, a geographical variety or race.