9-Letter Words Containing: A,T,U,S,Y

• the properties that distinguish organisms on the basis of their reproductive roles

• 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.

• the main cavity of the ear; between the eardrum and the inner ear

• the membrane in the ear that vibrates to sound

• a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it

• in a staunch manner