Naming multiple bitmapdataclass variables

I’m trying to figure out how to name multiple bitmapdataclass variables to accompany movie clips created in a for loop.

I can name the movieclips with

this.createEmptyMovieClip("mc_"+i, 10);

but I want to create a bitmapdata variable for each of those movie clips and name it similarly like bmd_1, bmd_2,… …bmd_n.

How would I go about this?