Some new entries in my lexicon, thanks to the parks and the Oxford English Dictionary:
- caldera
- (kalˈdera) [a. Sp. caldera = Pg. caldeira, F. chaudière cauldron, kettle, boiler:—L. caldāria, pl. of prec.]
A deep cauldron-like cavity on the summit of an extinct volcano.
- fumarole
- (ˈfjuːmərəʊl) [ad. F. fumerolle (fumarolle): see FEMERELL [ad. OF. fumeraille altered form of fumerole = It. fumaruolo:— L. fūmāriolum, dim. of fūmārium, f. fūmus smoke.] .]
A hole or vent through which vapour issues from a volcano; a smoke-hole.
- pika
- (U.S. ˈpaɪkə, ˈpikə) [< Evenki piika.]
Any of various small rabbit-like mammals constituting the genus Ochotona and family Ochotonidae (order Lagomorpha), having short, rounded ears, reddish-brown or grey fur, and a very small tail, and found in the mountains and deserts of western North America and north-east and central Asia. Also called calling hare, mouse-hare, rock rabbit, etc.
- rut
- (rʌt) [a. OF. rut, var. of ruit:—pop. L. *rugĭt-um for L. rugītum, acc. of rugītus, f. rugīre to roar.]
1. The annually recurring sexual excitement of male deer; also, by extension, periodic sexual excitement in other animals, as goats, sheep, etc.
(Earliest citation, c1410): Master of Game (MS. Digby 182) ii, Þei [sc. harts] be in hir loue, þe whiche men calleth Rutte, aboute þe tyme of holy rode in Septembre.
- travertine
- (ˈtrævə[r]tɪn) [ad. It. travertine, older tivertino ‘a kind of stone to build withall’ (Florio):—L. tīburtīnus TIBURTINE. Cf. F. travertine, in Cotgr. trevertin.]
A white or light-coloured concretionary limestone, usually hard and semi-crystalline, deposited from water holding lime in solution; also called travertine stone; quarried in Italy for building. A less solid porous form is known as calcareous tufa.
- snackcident
- Alas, this one was missing from the OED. Luckily I have another source:

And for those of you who were wondering, the Grand Tetons are so called because the mountains were nicknamed Les Trois Tétons, “the three breasts.”

