subspecies

Short definition from Wiktionary

Noun

1. 1
   A rank in the classification of organisms, below species.
2. 2
   A taxon at that rank, often indicated with trinomial nomenclature (such as Felis silvestris silvestris in zoology and Pinus nigra subsp. salzmannii in botany).
3. 3
   A subdivision of a species in other scientific disciplines.