Lewis Short
glŏmĕrātĭo (noun F) : id. I., of horses
* A bringing of the legs together into a ball, a trotting (or, as others say, a prancing or an ambling): Asturcones, quibus non vulgaris in cursu gradus, sed mollis alterno crurum explicatu glomeratio,Plin. 8, 42, 67, § 166; cf. Verg. G. 3, 117.
Charlton T. Lewis, Charles Short, A Latin Dictionary