fence lizard: spiny lizard often seen basking on fences in the United States and northern Mexico
spiny lizard: any of numerous lizards with overlapping ridged pointed scales; of North America and Central America
phase iii clinical trial: a large clinical trial of a treatment or drug that in phase I and phase II has been shown to be efficacious with tolerable side effects; after successful conclusion of these clinical trials it will receive formal approval from the FDA