15-Letter Words Containing: A,E,O,R,R,R,S,T

• organize as a territory

• place on a territorial basis

• extend by adding territory

• a person who is an authority on history and who studies it and writes about it

• roentgenographic examination of arteries

• The gross structure of a material or tissue as visible to the unaided eye or at very low levels of magnification.

• The gross structure of a pure metal or alloy, as revealed by magnifications of 10X or less.

• of or relating to or given to insurrection

• A transformer with a single winding, output being taken from taps