Webster's English Dictionary

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ecotype

eco.type \-.ti-p\ \.ek-o--'tip-ik, .e--ko--\ \-'tip-i-k(*-)le-\ n : a 
   subdivision of an ecospecies that comprises individuals interfertile w ith 
   each other and with members of other ecotypes of the same ecospecies but 
   surviving as a distinct group through environmental selection and isolation 
   and that is comparable with a taxonomic subspecies - eco.typ.ic aj