| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a fool or simpleton; ninny. |
| tetragonal (tě-trāg'ə-nəl) Pronunciation Key
Relating to a crystal having three axes, two of which are of the same length and are at right angles to each other. The third axis is perpendicular to these. The mineral zircon has tetragonal crystals. See illustration at crystal. |