Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. ăper, pri, m. [cf. old Germ. Ebar;  Germ. Eber; Angl.-Sax. bār  =  aper, verres; Engl. boar; cf. Lat. caper, with change of meaning, and the Gr. κάπρος], a wild boar. 
- I. 
- A.  Lit., Ov. M. 8, 282; 9, 192; 10, 550; 10, 715; Verg. E. 7, 29; 10, 56; id. A. 1, 324 al.: aper Erymanthius, Cic. Tusc. 4, 22, 50: Arcadius, the Erymanthian boar slain by Her cules, Mart. 9, 104: aper de silvā, Vulg. Psa. 79, 14.
Among the Romans a delicacy, Juv. 1, 140.
Masc. form used of the female in Varr. L. L. 8, 47, p. 183 Müll., though Pliny had formed apra, q. v. 
- B.  Prov. 
 
- 1.  Uno saltu duos apros capere, to kill two birds with one stone, Plaut. Cas. 2, 8, 40.
 
- 2.  Apros immittere liquidis fontibus, for something perverse, inconsiderate, Verg. E. 2, 59.
 
 - II.  Transf. 
 
- A.  A standard of the Roman legions, Plin. 10, 4, 5, § 16.
 
- B.  A kind of fish, Enn. ap. App. p. 486: is, qui aper vocatur in Acheloo amne, grunnitum habet, Plin. 11, 51, 112, § 267 Jan.
 
2. Ăper, pri, m., a Roman cognomen, Tac. Or. 2; Lampr. Commod. 2; Inscr. Grut. 692, 8.