Lewis Short
lăcertus (noun M) :
* The muscular part of the arm, from the shoulder to the elbow, the upper arm.
* Lit., opp. bracchium, the forearm, Lucr. 4, 829; cf.: laudat digitosque manusque, Bracchiaque et nudos mediā plus parte lacertos,Ov. M. 1, 501; and: subjecta lacertis brachia sunt,id. ib. 14, 304; cf. also Quint. 8 prooem. 19: brachia quoque et lacertos auro colunt,Curt. 8, 9, 21.
* Transf.
* The arm (esp. as brawny, muscular): nam scutum gladium galeam in onere nostri milites non plus numerant quam umeros, lacertos, manus,Cic. Tusc. 2, 16, 37: Milo Crotoniates nobilitatus ex lateribus et lacertis suis,Cic. de Sen. 9, 27: excusso lacerto telum torquere,Sen. Ben. 2, 6; Prop. 2, 18 (3, 15), 37: lacertos collo imponere,Ov. H. 16, 219: lacerto jaculari,id. Am. 3, 12, 27: amplecti,id. ib. 3, 8, 11: candida cingantur colla lacertis,id. A. A. 2, 457: laevus,Verg. A. 11, 693; Hor. S. 1, 6, 74: adducto contortum hastile lacerto immittit,Verg. A. 11, 561: secto requiem sperare lacerto,Juv. 6, 106. —Of bees: spicula exacuunt rostris, aptantque lacertos,i. e. make trial of,Verg. G. 4, 74.
* Transf.
* A blow or cast from a strong arm, Sil. 16, 562; 1, 262.
* Trop., muscular power, muscle, strength, military force: in Lysia saepe sunt lacerti, sic ut fieri nihil possit valentius,Cic. Brut. 16, 64: hastas oratoris lacertis viribusque torquere,id. de Or. 1, 57, 242: me civilis tulit aestus in arma, Caesaris Augusti non responsura lacertis,Hor. Ep. 2, 2, 48; Flor. prooem. § 8: viribus confisus admirandisque lacertis,Juv. 10, 11.
Charlton T. Lewis, Charles Short, A Latin Dictionary