Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. st, interj., hist! whist! hush! st, tale verbum cave faxis, Naev. ap. Charis. p. 214 P.: st, st, tacete, Plaut. Ep. 2, 2, 1: st, tacete, quid hoc clamoris? Poët. ap. Cic. de Or. 2, 64, 257: st, litteras tuas exspecto, Cic. Fam. 16, 24, 2; Plaut. Bacch. 5, 2, 37; id. Most. 2, 2, 58; 2, 2, 74; 3, 2, 163 sq. al.; Ter. And. 4, 1, 59; id. Heaut. 3, 3, 36; id. Phorm. 2, 3, 3; 5, 1, 16.