15-Letter Words Containing: _,A,E,F,F,O

• in an ineffective manner

• A device that uses diffraction (especially X-ray diffraction) to investigate the structure of matter.

• a disposition to be distant and unsympathetic in manner

• capacity or power to produce a desired effect

• a discrimination between things as different and distinct on the basis of their characteristics or attributes

• the mathematical process of obtaining the derivative of a function

• (biology) the structural adaptation of some body part for a particular function