sub-Apennine
/ˌsʌbˈapɪnʌɪn/noun
In †singular and plural With the: a range of low hills skirting the western slopes of the Apennines in Italy.
adjective
Of or relating to this range of hills or (Geology, now chiefly historical ) the Pliocene strata which are exposed there. Also more widely: designating the region adjacent to the Apennines; of or relating to this region.
Origin
Early 19th century; earliest use found in James Smith (1775–1839), writer and humorist. From sub- + Apennine, after Italian subappennini, †subapennini.