S1Q10U1A1R1E1
15 points
SQUARE is validvalid
having four equal sides and four right angles [adj SQUARER, SQUAREST] / to make square [v SQUARED, SQUARES, SQUARING] : SQUARER [n]
rigidly conventional [adj SQUARER, SQUAREST, SQUARELY] / to make equal all over [v SQUARED, SQUARING, SQUARES]