12-Letter Words Containing: I,R,U,V

• a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures

• liable to sudden unpredictable change

• not made explicit

• a respondent who avoids giving a clear direct answer

• Any quadrivalent chromosome

• Having a valence of four

• (of a vaccine) Protecting against four different (usually flu) viruses.

• Said of a graph: that all of its vertices have degree four.

• deliberately impassive in manner

• Any of the genus Sempervivum of succulent plants, the houseleeks or liveforevers.