10-Letter Words Containing U,P,C,A,S,T,S,_

• An underfloor space or flue through which heat from a furnace passes to heat the floor of a room or a bath.

• An underfloor heating system, even without such an underfloor space or flue, as adapted for modern housing.

• to believe especially on uncertain or tentative grounds

• talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion

• reflect deeply on a subject

• invest at a risk

• indicate, as with a sign or an omen

• commence in a manner calculated to bring good luck

• a pressure suit worn by astronauts while in outer space