| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
Lamarck La·marck (lə-märk', lä-), Chevalier de Jean Baptiste Pierre Antoine de Monet. 1744-1829.
French naturalist noted for his theories on evolution by adaptative modification and for classifying animals into vertebrates and invertebrates.
| Lamarck (lə-märk', lä-) Pronunciation Key
French naturalist who introduced the taxonomic distinction between vertebrates and invertebrates. His theory that the acquired characteristics of a species could be inherited by later generations was a forerunner to Charles Darwin's theory of evolution, although it was eventually discredited. |