Lewis & Short

grōmātĭcus (grūm-), a, um, adj. [groma], of or belonging to field-surveying or castrametation.

  1. I. Adj.: disciplina, Cassiod. Varr. 3, 52.
  2. II. Subst.: grōmā-tĭca (grūm-), ae, f., the art of field-surveying or castrametation, Cassiod. Varr. 3, 52.
          1. (β) grōmātĭci, ōrum, m., writers on field-surveying, Hyg. de Mun. Castr. § 12.