per·pen·dic·u·lar 
/ˌpɚpənˈdɪkjəl̟ɚ/ adjective
/ˌpɚpənˈdɪkjəl̟ɚ/ adjective : going straight up or to the side at a 90 degree angle from another line or surface
▪ a perpendicular line ▪ She lives on the street that is perpendicular to mine. ▪ a perpendicular cliff [=a cliff that goes straight up] — compare parallel
▪ a perpendicular line ▪ She lives on the street that is perpendicular to mine. ▪ a perpendicular cliff [=a cliff that goes straight up] — compare parallel
— per·pen·dic·u·lar·ly adverb
▪ The two cars were parked perpendicularly to each other.
▪ The two cars were parked perpendicularly to each other.
