type of rifle used by the British army early 20c., 1902 (adj.); 1910 (n.), named for J.P. Lee (1831-1904), U.S. designer of bolt action + Enfield (q.v.).
1906 in reference to a type of lawn or deck chair said to have been designed in 1903 by a Thomas Lee, owner of the Westport Mountain Spring, a resort in the Adirondack region of New York State. Commercial manufacture is said to have begin the following year but it was at first called Westport chair after the town where it was made.
Adirondack Mountains is a back-formation from Adirondacks, which was treated as a plural noun but really it is from Mohawk (Iroquoian) adiro:daks "tree-eaters," a name they applied to neighboring Algonquian tribes. The -s is an imperfective affix.