Today we will look at the form पितृव्यः mNs from श्रीमद्भागवतम् Sb10.48.29.

श्रीभगवानुवाच
त्वं नो गुरुः पितृव्यश्च श्लाघ्यो बन्धुश्च नित्यदा ।
वयं तु रक्ष्याः पोष्याश्च अनुकम्प्याः प्रजा हि वः ∥ १०-४८-२९ ∥

श्रीधर-स्वामि-टीका
वो युष्माकं प्रजाः पुत्रा हि वयमिति ∥ २९ ∥

Gita Press translation – The glorious Lord said: “You are our preceptor (counsellor) and uncle, nay, our praiseworthy friend. We ever deserve to be protected, nourished and treated with compassion by you, as a matter of fact, since we are your children (29).”

पितुर्भ्राता = पितृव्यः – uncle (father’s brother)

(1) पितृ ङस् + व्यत् । By 4-2-36 पितृव्यमातुलमातामहपितामहाः – The forms ‘पितृव्य’, ‘मातुल’, ‘मातामह’ and ‘पितामह’ are given as ready-made forms. They are used in the meaning of father’s brother, mother’s brother, mother’s father and father’s father respectively.

Note: As per the वार्तिकम् ‘पितुर्भ्रातरि व्यत्’ – The affix ‘व्यत्’ is to be applied to get the final form ‘पितृव्य’ (listed in the सूत्रम् 4-2-36) – which denotes father’s brother.

(2) पितृ ङस् + व्य । अनुबन्ध-लोपः by 1-3-3 हलन्त्यम्, 1-3-9 तस्य लोपः।

Note: ‘पितृ ङस् + व्य’ gets the designation प्रातिपदिकम्‌ by 1-2-46 कृत्तद्धितसमासाश्च। This allows 2-4-71 सुपो धातुप्रातिपदिकयोः to apply in the next step.

(3) पितृ + व्य । By 2-4-71 सुपो धातुप्रातिपदिकयोः – A सुँप् affix takes a लुक् elision when it is a part of a धातुः or a प्रातिपदिकम्।

= पितृव्य । Note: The प्रातिपदिकम् ‘पितृव्य’ declines like राम-शब्दः।