Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sup-pĕtĭae (subp-), ārum, f. [suppeto], that which comes to aid one, aid, assistance, succor (ante-class. and post-Aug.; used only in nom. and acc.; syn.: auxilium, subsidium): auxilia mihi et suppetiae sunt domi, Plaut. Ep. 5, 2, 12: non metuo meae quin uxori latae suppetiae sient, id. Am. 5, 1, 54; id. Ep. 5, 1, 52; id. Mil. 4, 2, 62; id. Rud. 3, 2, 10; 4, 4, 39; id. Men. 5, 7, 14; Suet. Vesp. 4: piscibus ad suppetias uti, App. Mag. p. 299, 33: suppetias ferre, Amm. 16, 4, 3; App. M. 6, p. 184, 39.
The acc. suppetias sometimes occurs with verbs of motion for ad suppetias (to go, come, send, etc.), to any one’s assistance: nae tibi, suppetias tempore adveni modo, Plaut. Men 5, 7, 31: venire, Auct. B. Afr. 5: proficisci, id. ib. 25: ire, id. ib. 39: occurrere, id. ib. 66; 68: accurrere, App. M. 9, p. 234.
suppĕtĭor (subp-), ātus, 1, v. dep. n. [suppetiae], to come to the aid of, to assist, succor (very rare; most freq. in App.): quod mihi suppetiatus es, gratissimum est, Cic. Att. 14, 18, 2: miserrimo seni, App. M. 8, p. 210, 32.
Absol.: suppetiatum decurrunt anxii, run to aid, App. M. 4, p. 147, 9: proclamare suppetiatum, id. ib. 1, p. 108, 30; 8, p. 209, 35.