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| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
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. |