13-Letter Words Containing: A,B,E,E,M,N,O,R

• a thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell

• capable of being measured by a common standard

• difficult or impossible to evaluate with precision

• a factor whose effects cannot be accurately assessed

• a political orientation originating in the 1960s; blends liberal political views with an emphasis on economic growth