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| a chattering or flighty, light-headed person. |
| 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. |
promoter pro·mot·er (prə-mō'tər)
n.
A substance that increases the activity of a catalyst.
A DNA molecule to which RNA polymerase binds, initiating the transcription of mRNA.
A chemical that may promote carcinogenicity or mutagenicity.
| promoter (prə-mō'tər) Pronunciation Key
The region of an operon that acts as the initial binding site for RNA polymerase. |