ecotonenoun [ C ]
uk/ˈiː.kəʊ.təʊn//ˈiː.koʊ.toʊn/specializeda region where one type of habitat or natural environment meets another:
The ecotone between forest and pasture was overgrown with lantana plants.
the tropical/subtropical ecotone
ecotonal
adjective uk/ˈiː.kəʊ.təʊ.nəl//ˈiː.koʊ.toʊ.nəl/
the ecotonal boundaries between climatic regimes