father’s sister, aunt; decl. similarly to pitā & mātā Dhp-a.i.37 acc. sg. pitucchasaṃ [Sk. *svasaṃ instead of *svasāraṃ] Ja.iv.184.

• -dhītā aunt’s daughter, i.e. (girl) cousin Dhp-a.i.85
• -putta aunt’s son, i.e. (boy) cousin SN.ii.282 (tisso bhagavato p.); SN.iii.106 (id.); Ja.ii.119, Ja.ii.324.

pitu + svasā, cp. Sk. pitṛ-ṣvasṛ