1) Anthropod segments 2) Segments of worms 
The paired, blocklike masses of mesoderm, arranged segmentally alongside the neural tube of the embryo, forming the vertebral column and segmental musculature. ... (12 Dec 1998) ... 
Segmentally arranged blocks of mesoderm lying on either side of the notochord and neural tube during development of the vertebrate embryo. Somites are formed sequentially, starting at the head. Each somite will give rise to muscle (from the myotome region), spinal column (from the sclerotome), and dermis (from dermatome).
In avian biology, paired segments that appear along the middle region of the cranial-caudal axis of the very early embryo; eventually they will become vertebrae and muscle.
Mesodermal structures formed during embryonic development that give rise to segmented body parts such as the muscles of the body wall.