Refers to a specific type of guava fruit.
El guayabón en la mesa estaba maduro y listo para comer.
The large guava on the table was ripe and ready to eat.
El guayabón que compré en el mercado es tan grande que no sé cómo lo llevaré a casa.
The large guava I bought at the market is so big that I don't know how I'll carry it home.