small blind

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun In certain variations of poker, the smaller of the two blinds, placed by the player one seat to the left of the dealer.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun poker The smaller of the forced bets, usually equivalent to half the minimum bet, depending on the variation of poker played.
• noun poker The player forced to pay such a bet.