13-Letter Words Starting SY & Ending S

• 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)

• an organizer who puts things in order

• an automotive system for shifting gears in which the gears revolve at the same speed and so shift smoothly

• 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)

• birth defect in which there is partial or total webbing connecting two or more fingers or toes

• the pattern of syllable formation in a particular language

• a sensation that normally occurs in one sense modality occurs when another modality is stimulated