1. ăcus — Lewis & Short
ăcus, ūs, f.cf. 2. acer.
quasarcinatrix veletiam ornatrix utitur,Paul. ex Fest. p. 9 Müll.
mirabar vulnus, quod acu punctum videtur,Cic. Mil. 24.—Hence, acu pingere, to embroider, Verg. A. 9, 582; Ov. M. 6, 23; cf. Plin. 8, 48, § 191; Isid. Orig. 19, 22, 22.—Esp. a hair-pin:
figat acus tortas sustineatque comas,Mart. 14, 24:
foramen acūs,the eye of a needle, Vulg. Matt. 19, 24.—Also, a surgeon's needle, a probe, Cels. 7, 17.—Hence,
to denote careful and successful effort: si acum quaereres, acum invenisses,id. Men. 2, 1, 13.—