Answer: perpendiculars

AnswerCrossword Clue
perpendicularsPERPENDICULAR, a perpendicular line
perpendicularsAn instrument for indicating the vertical line from any point, as a spirit level or plumb line
perpendicularsPerpendicular position or direction
perpendicularsA straight line at an angle of 90░ to a given line, plane, or surface