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| 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. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| ball valve | |
| —n | |
| a one-way valve consisting of a metal ball with a cylindrical hole fitting into a concave seat over an opening | |
ball valve n.
A valve regulated by the position of a free-floating ball that moves in response to fluid or mechanical pressure.