Why was "tantrum" trending last week?
1894, a hybrid coined by Lord Kelvin from Latinized comb. form of Greek kheir "hand" (from PIE *ghes- "hand;" see chiro-) + -al (1).
chiral chi·ral (kī'rəl)adj. Of or relating to the structural characteristic of a molecule that makes it impossible to superimpose it on its mirror image.