| the offspring of a zebra and a donkey. |
| 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. |
| Leibniz (līb'nĭts) Pronunciation Key
German philosopher and mathematician who invented the mathematical processes of differentiation and integration, which greatly expanded the field of calculus. Leibniz also established the foundations of probability theory and conceived the idea for a practical calculating machine. |