The Great Plains, the Midwest, the Mississippi Valley and the southern United States are all areas that are vulnerable to tornadoes. They are relatively rare west of the Rockies and are also less frequent in the northeastern states. Tornado Alley is a colloquial term for an area particularly prone to tornadoes.
GCIDE(0.00 / 0 votes)Rate this definition: 1  Limpid(a.) Clear and unambiguous; lucid; easy to understand; -- of speech and writing; as, limpid prose. 2  Limpid(a.) Calm, untroubled, and without worry; serene.
zooid in Medicine. zooid zoÂ·oid (zÅ'oid') n. An organic cell or organized body that has independent movement within a living organism, especially a motile gamete such as a spermatozoon. An independent animallike organism produced asexually, as by budding or fission.