perpendicular

At or forming a right angle (to something).

In most houses, the walls are perpendicular to the floor.

A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place. Applying a force tangential to the knob is essentially equivalent to applying one perpendicular to a radial line defining the lever.

Exactly upright; extending in a straight line toward the centre of the earth, etc.

Independent of or irrelevant to each other; orthogonal.

Hey, I'm not unsabotaging anything! This is completely perpendicular sabotage!

A line or plane that is perpendicular to another.

A device such as a plumb line that is used in making or marking a perpendicular line.

A meal eaten at a tavern bar while standing up.

Of a style of English Gothic architecture from the fourteenth and fifteenth centuries, marked by stiff and rectilinear lines, mostly vertical window-tracery, depressed or four-centre arch, fan-tracery vaulting, and panelled walls.