Lewis & Short

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The word acusticus could not be parsed. Trying a normal dictionary lookup:

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1. ăcus, ūs, f. [cf. 2. acer].

  1. I. A needle or pin, as being pointed, both for common use and ornament:“quasarcinatrix veletiam ornatrix utitur,” Paul. ex Fest. p. 9 Müll.
    1. A. Lit.: 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,
    2. B. Trop.: acu rem tangere, to touch the thing with a needle; in Engl. phrase, to hit the nail on the head, Plaut. Rud. 5, 2, 19; so, to denote careful and successful effort: si acum quaereres, acum invenisses, id. Men. 2, 1, 13.
  2. II. The tongue of a buckle, Treb. Poll. Claud. 14.
  3. III. I. q. acus, ĕris, Col. 2, 10, 40.
  4. IV. An implement of husbandry, Pall. 1, 43, 2.

2. ăcus, ĕris, n. (also, ūs, f., v. 1. acus, III.) [kindred with acus, ūs, Goth. ahana, old Norse agn, old Germ. Agana], = ἄχυρον, the husk of grain and of pulse; chaff, Cato, R. R. 54, 2; Varr. R. R. 1, 52; 57; 3, 9, 8.

3. ăcus, i, m. [1. acus], a kind of sea-fish with a pointed snout, the hornpike or gar-pike (Gr. βελόνη): acus sive belone unus piscium, etc., Plin. 9, 51, 76, § 166: et satius tenues ducere credis acos, Mart. 10, 37, 6; cf. Plin. 32, 11, 53, § 145, where belonae again occurs. (Some read una for unus in the passage from Plin., and acūs for acos in Mart., as if these forms belonged to 1. acus.)

Ăcūsĭlas, ae, m. [from Ἀκουσίλαος], an Argive historian, Cic. de Or. 2, 12, 53.