a. nonce-wd. [f. TRI- + L. montānus: see MONTANE, and cf. L. Trimontium, place-name.] Having, or having some relation to, three mountains or hills; in quots., belonging to Boston in Massachusetts. So Trimountain a. in same sense; sb. (in pl.) a set or group of three hills.
1837. Hawthorne, Twice-told T. (1851), II. i. 8. From this station,… Gage may have beheld his disastrous victory on Bunker Hill, (unless one of the tri-mountains intervened). Ibid. (1840), Biog. Sk., Mrs. Hutchinson (1879), 169. The dusk has settled … upon … the Trimountain peninsula.
1885. E. C. Stedman, in Century Mag., XXIX. 511. It has require some independence for a trimontane [i.e., Bostonian] poet to be a progressive and speculative thinker.
