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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. |
| a chattering or flighty, light-headed person. |
hydrogenation hy·dro·gen·a·tion (hī'drə-jə-nā'shən, hī-drŏj'ə-)
n.
The addition of hydrogen to a compound, especially to solidify an unsaturated fat or fatty acid.