avada kedavra - a question

[Shunra Shunrata]

No: HPFGUIDX 126414


A question on the origin of Avada Kedavra - 

As far as I know from learning Aramaic the original phrase was "avra
kedavra" - "I will create with my speech" - i.e. it is a
charm/spell/whatever of *creation*. In HP I see it as "avada kedavra" 
which may be seen as coming from the root "avad" to be destroyed - "I
will destroy with my speech",  which is pretty much what the avada
kedavra is supposed to do.

Does anyone know if this modification is intentional on JKR's part or
whether she was just mistaken on the original phrase?

Thanks muchly

Shunra