Thanks! I was having a hard time finding a word pronounced "xiao" that meant some kind of grain. I see from this site (http://www.travelchinaguide.com/intro/focus/solar-term.htm) that this particular term, rather than being translated as "Grain Full," should be translated as "Lesser Fullness of Grain," and if we understand that the "of grain" is left out, then just "lesser fullness" would be 小滿.

Me speak Chinese real good!