Spatha

The term "spatha" is a botanical term that refers to a specific part of the inflorescence (flower structure). In the context of an anthurium, this means the following:

The spathe (plural: spathae) is a modified leaf that encloses and protects the spadix. That's why it's also called a flower sheath in German. It is usually larger and showier than the spadix and also serves to attract pollinators. The spathe can come in various colors, including shades of red, pink, white and green.

Together with the spadix (flower spadix, see explanation here: Spadix), the spadix and spathe form the flower structure, which are crucial defining characteristics for genera and species of the Araceae family.