noStroke()
Disables drawing points, lines, and the outlines of shapes.
Calling noStroke() is the same as making the stroke completely transparent, as in stroke(0, 0). If both noStroke() and noFill() are called, nothing will be drawn to the screen.
Examples

function setup()
size(100, 100)
background(200)
noStroke()
square(20, 20, 60)
describe('A white square with no outline.')
end
Syntax
noStroke()