Crenel :: Crenel (n.) An embrasure or indentation in a battlement; a loophole in a fortress; an indentation; a notch. See Merlon, and Illust. of Battlement..
Crenulation :: Crenulation (n.) The state of being minutely scalloped.
Hippocrene :: Hippocrene (n.) A fountain on Mount Helicon in Boeotia, fabled to have burst forth when the ground was struck by the hoof of Pegasus. Also, its waters, which were supposed to impart poetic inspiration..