Lewis Short
(adjective) : formācĕus, a, um, forma
* Made in a form or mould: parietes, quos appellant formaceos, quoniam in forma circumdatis duabus utrimque tabulis inferciuntur verius quam instruuntur,Plin. 35, 14, 48, § 169.
Charlton T. Lewis, Charles Short, A Latin Dictionary