12-Letter Words Containing: _,C,R,S,Y

• operating in unison

• an instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines)

• make synchronous and adjust in time or manner

• happen at the same time

• make (motion picture sound) exactly simultaneous with the action

• arrange or represent events so that they co-occur

• operate simultaneously

• cause to indicate the same time or rate

• Exhibiting symmetry around an axis; exhibiting cylindrical symmetry.

• having become fixed and definite in form

• having both internal structure and external form of a crystal

• become fused

• unite (beliefs or conflicting principles)