Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. pīpĭo, āre, v. n., to pip, chirp, whimper: infantes pipiantes, Tert. Monog. 16: imbres pipiavit, id. adv. Valent. 15.
2. pīpĭo, īre, v. n., to peep, pip, chirp: aviarius auscultetur, si (pulli) pipiant, Col. 8, 5, 14; Auct. Carm. Philom. 30.
3. pīpĭo, ōnis, m., a young piping or chirping bird, a squab: servos habuit vectigales qui eos (palumbes) ex ovis et pullicenis ac pipionibus alerent, from the produce of the eggs and chickens, Lampr. Alex. Sever. 41.