11-Letter Words Starting: PROT

• A cloud of gas which is starting to form a galaxy.

• the anterior part of an insect's thorax; bears the first pair of legs

• a protein in blood plasma that is the inactive precursor of thrombin

• Relating to a sensory nerve that detects the presence of a stimulus without determining its location.

• Relating to first symptoms of a disease, as in the sense of protopathic bias

• The rapid creation of prototypes of a new product for demonstration and research purposes

• One of the earliest humans.