Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ambō̆, bae, bo, num. (nom. plur. ambo for ambae, Plaut. Merc. 2, 1, 7; acc. plur. orig. ambo, analog. to the Gr. ἄμφω, but from the adj. use of the word ambos arose; acc. ambo is found in Plaut. Am. 1, 2, 8; 5, 1, 67; id. As. 3, 3, 121; id. Curc. 5, 3, 14; id. Cist. 2, 1, 49; id. Ep. 2, 2, 19; id. Bacch. 4, 8, 19; 5, 2, 69; id. Most. 3, 2, 140; id. Rud. 3, 5, 7; Afran. ap. Charis. p. 96 P.; Cic. (who never uses ambos) Fam. 5, 8; 9, 13; Caes. (who never uses ambos) B. C. 1, 48; Verg. (who never uses ambos) E. 6, 18; id. G. 4, 88; id. A. 12, 342; Hor. (who never uses ambos) S. 2, 3, 180; 2, 7, 62; Liv. 3, 62; 7, 19; 26, 7; 26, 26; 27, 27; 30, 14; 35, 22; 38, 53; 40, 46; 41, 18; 45, 19; Mart. 7, 40; Sil. 4, 175; 17, 427 al.; ambos is found in Afran. Com. Rel. p. 194 Rib. bis; Plaut. Bacch. 5, 1, 29; id. Ps. 1, 3, 21; Ter. (who never uses ambo) Eun. 5, 8, 39; id. Heaut. 4, 3, 33; 5, 2, 42; id. Ad. 1, 2, 51; 5, 9, 5; Prop. 3, 13, 18; Liv. 2, 10, 6; 22, 34, 10; Sall. (who never uses ambo) J. 21, 4; id. Fragm. 4, 19, 5 Kritz; Ov. (who never uses ambo) H. 10, 51; Tac. (who never uses ambo) A. 13, 54; Vulg. Tob. 3, 25; ib. Eph. 2, 16; cf. Charis. p. 95; Prisc. p. 744 P.; Rudd. I. p. 57; Kühn. ad Cic. Tusc. 1, 46, 110; Neue, Formenl. II. p. 145 sqq.) [ἄμφω, ἀμφότεροι, Paul. ex Fest. p. 4 Müll.; kindr. with Sanscr. ubhāu, dual nom. = ambo; Zend. uba; Slav. oba; Lith. abù; Goth. bai, bajōths; Germ. beide; Engl. both], both (of two objects whose duality is assumed as already known; when not already known, they are designated by duo. The difference between ambo and uterque is thus given by Charis. p. 49 P.: Ambo non est dicendum, nisi de his, qui uno tempore quid faciunt, utpote reges Eteocles et Polynices ambo perierunt quasi unā; Romulus autem et Africanus non ambo triumphārunt, sed uterque; quia diverso tempore).