(anatomy) Either of the two valves in the heart, situated between the atria and the ventricles, that prevent backflow from the ventricles into the atria during systole.

A North Atlantic species of wolffish, Anarhichas minor.

The boredom of a dull PowerPoint presentation, normally consisting of simple bulleted lists and conventional graphics.

To convert into, or change to, a vitriol; to make into sulphuric acid or a sulphate. / To subject to the action of, or impregnate with, vitriol.