|a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.|
|the offspring of a zebra and a donkey.|
|Arrhenius (ə-rē'nē-əs) Pronunciation Key
Swedish physicist and chemist who developed the theory of electrolytic dissociation, which explained the process by which ions are formed or separated. For this work he was awarded the Nobel Prize for chemistry in 1903. He also investigated osmosis, toxins, and antitoxins.