Vṛddhi (Sanskrit: वृद्धि, IPA: [ˈʋr̩d̪d̪ʰi]) is a Sanskrit word meaning 'growth' (from Proto-Indo-European *werdʰ- 'to grow').
In Pāṇini's Sanskrit grammar, it is a technical term for long vowels produced by ablaut (vowel gradation), as for example in:
In modern Indo-European linguistics it is used in Pāṇini's sense, but not restricted to Sanskrit but applicable to the Indo-European languages in general as well as to the Proto-Indo-European (PIE) language from which this feature was probably inherited:
A vṛddhi-derivation or vṛddhi-derivative is a word that is derived by such lengthening, a type of formation very common in Sanskrit, but also attested in other languages. Such derivatives signify "of, belonging to, descended from". An example:
Tunnel seems so long
Touching the bottom
A slim reflexion
Punctured my vision
I didn't notice
Beside the last door
Standing on nothing
There was a mirror
Even inside... scrutinized
I am, he is, the face I hate
Refracting cells and prismed self
Who's X who's y in a blank place
I can't believe this is my image
Like the mirror without a frame
Baring a scarred side
Open in daylight
Recoil and reply
Farside of my pride
The introspection
Ruptures the blood core
Magnification
Draws out the mirror
Seeking me out
What will he find?
I am, he is, a repugnant state
I can't shake this curiosity
My privacy starts to fade
I can't believe this is my image
Like the mirror
A polar exchange
He gloating over my fleeting image
He used to be me
He knows who is free
How long will I wait... here
Stuck in this void place... here
I can't believe I am the immage
Within the mirror
Into the chrome lake
The glass is broken