| Blue | the sky as viewed during daylight |
|---|---|
| Blue | a state law regulating the sale of securities in an attempt to control the sale of securities in fraudulent enterprises |
| Blue | subshrubs of southeastern United States forming slow-growing clumps and having blue flowers in short terminal cymes |
| Blue | tall grass with smooth bluish leaf sheaths grown for hay in the United States |
| Blue | hydrated blue crystalline form of copper sulfate |
| Blue | an indelicate joke |
| Blue | south European plant having dark-eyed flowers with flat blue rays |
| Blue | a coarse prickly European weed with spikes of blue flowers |
| Blue | widely distributed European titmouse with bright cobalt blue wings and tail and crown of the head |
| Blue | North American plant having racemes of blue-violet flowers |
| Blue | short hairy perennial with early spring blue-violet or lilac flowers |
| Blue | hydrated blue crystalline form of copper sulfate |