The term SEED COAT is composed of four words: TESTA (5 letters), ARIL (4 letters), POD (3 letters), and BRAN (4 letters). Testa is the outermost layer of a seed, which is composed of a protective covering that helps protect the seed from environmental damage. An ARIL is a fleshy or waxy coating that surrounds some seeds, such as those of the yew tree. A POD is a dry, dehiscent fruit that splits open to release its seeds. Finally, BRAN is the outer layer of a cereal grain, which is removed during the milling process. Together, these four words form the term SEED COAT, which refers to the protective layers that surround a seed.