According to the Royal Institute Dictionary 1999, loi (ลอย) means "to float", while krathong (กระทง) has various meanings, one of which is "a small container made of leaves which can be floated on water during the Loi Krathong festival". Krathong is traditionally a small leaf container which is made to hold a small portion of goods like a traditional Thai dish (such as "Hor Mok") or dessert. The traditional krathong used for floating at the festival are made from a slice of a banana tree trunk or a spider lily plant. Modern krathongs are more often made of bread or Styrofoam. A bread krathong will disintegrate after a few days and can be eaten by fish. Banana stalk krathong are also biodegradable, but Styrofoam krathongs are sometimes banned, as they pollute the rivers and may take years to decompose. A krathong is decorated with elaborately-folded banana leaves, three incense sticks, and a candle. A small coin is sometimes included as an offering to the river spirits.