Quadratus

Quadratus is Latin for square. Quadratus was also a cognomen from the Roman Republic and Roman Empire. It may refer to:

People

 * Lucius Ninnius Quadratus, a tribune of the plebs in 58 BC and a warm friend to Roman Senator Marcus Tullius Cicero
 * Gaius Volusenus Quadratus, a military officer of the late Roman Republic in 40s BC
 * Fannius Quadratus, a Roman poet and a contemporary of Horace
 * Gaius Antius Aulus Julius Quadratus, an ordinary consul serving in 105
 * Quadratus of Athens, the Christian writer and saint
 * Quadratus (martyr), the name of several saints and martyrs
 * Lucius Statius Quadratus, an ordinary consul serving in 142
 * Gaius Julius Quadratus Bassus, Legate at Judaea between 102 and 105, Consul of Rome in 105 and Proconsul of Asia in 105, grandfather of:
 * Gaius Asinius Quadratus, the Roman historian, father of:
 * Gaius Asinius Protimus Quadratus (died 235), Proconsul of Achaea in 220
 * Any of various members of the Roman gens Ummidia

Anatomy
In anatomy, quadratus refers to a quadrilateral (square or rectangular) shape. Structures with quadratus in their name are:
 * Lobus quadratus, the quadrate lobe of liver
 * Pronator quadratus muscle, in the forearm
 * Quadratus femoris muscle, in the posterior hip
 * Quadratus lumborum muscle, in the back
 * Quadratus plantae muscle, in the foot