Definition of Reverse bid:

If you bid 2 suits, and in order to support your first bided suit your partner has to bid to the 3 level - then it's a reverse bid.

 

examples :

 

1CL - 1D

2H               partner has to bid 3 club if he wants to show a club support, than it's a reverse bid.

 

1CL - 1NT

2H              same thing, even though in a contrary to the 1st example you're "forced" to bid 2H.

I play 2 over 1 and still play the sequence of 1 H - 2 CL - 2 SP as a reverse, as 2H from the opener is a relay to show a minimum strength, not have to be with 6 Hearts.