tamindi = diamond (noun) (gemstone) (some things Google found for "tamindi"; an uncommon to rare term; "TAMindi" seems to be a program that is probably Turkish)
Word derivation for "diamond" :
Basque = diamante, Finnish = timantti
Miresua = tamindi
I decided to start the word with the "t", the most common letter. That also made it look less like English. The common sequence of letters "mant" was altered to "mind".