Lewis Short
porrectÄo (noun F) : 1. porrigo
* A stretching out, extending, extension: digitorum (opp. contractio),Cic. N. D. 2, 60, 150: bracchii,Auct. Her. 3, 15, 27.
* Concr., a straight line (opp. circinatio), Vitr. 10, 3, 8.
Charlton T. Lewis, Charles Short, A Latin Dictionary