Grabh - To Seize, same as English Grab. The word is used in the most ancient books of the Word Knowledge, called Vedas, in Rig Veda.
Grabh-i-t - Passive Past Participle, and makes it an Action Noun
Grabh-ant - Strong form of Active Present Participle Root, and makes it an Action Noun
Grabh-a-t - Weak form of Active Present Participle Root, and makes it an Action Noun
Grabh-a-tR - Root for Agent Noun, Present Participle.
Grabh-ta-a or GrabhtA - Male Singular Agent Noun "First Case indicating Subject Case".
Grabh-t-R-I -> Grabh-i-tI - Feminine Singular Agent Noun. For Ancient Earth was mother Earth and anything associated with it was a Feminine. There is one rule in Conjugation of Verbs, where "R" sound becomes "ir", and then one needs to add "I" sound for making it a Feminine.
Grabh-a-iti - Add 'a' for converting Verb to Noun - as one of the tules, and 'iti' is for 'thus', and together it makes it a compound. That which has grabbed - thus.