15-Letter Words Containing: A,E,F,F,I

• The quality of being difficult to delete, remove, wash away, blot out, or efface.

• 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

• mark as different

• be a distinctive feature, attribute, or trait; sometimes in a very positive sense

• calculate a derivative; take the derivative

• become different during development

• evolve so as to lead to a new species or develop in a way most suited to the environment

• become distinct and acquire a different character