Isle of Portland a rugged limestone peninsula in SW England, in Dorset, connected to the mainland by a narrow isthmus and by Chesil Bank: the lighthouse of Portland Bill lies at the S tip; famous for the quarrying of Portland stone, a fine building material
2.
an inland port in NW Oregon, on the Willamette River: the largest city in the state; shipbuilding and chemical industries. Pop: 538 544 (2003 est)
3.
a port in SW Maine, on Casco Bay: the largest city in the state; settled by the English in 1632, destroyed successively by French, Indian, and British attacks, and rebuilt; capital of Maine (1820--32). Pop: 63 635 (2003 est)
Portland2 (ˈpɔːtlənd)
—n
3rd Duke of. title of William Henry Cavendish Bentinck. 1738--1809, British statesman; prime minister (1783; 1807--09); father of Lord William Cavendish Bentinck
in Portland cement, 1720, named by its inventor, Eng. mason Joseph Aspdin, from resemblance of the color to the stone of Portland peninsula on the coast of Dorsetshire.