In 1839, Theodor Schwann would expand Schleiden's cell theory to include the animal world, establishing cell theory as the fundamental concept in biology. Schleiden included this article and others in a botany textbook--one that introduced new teaching methods which would dominate the instruction of botany for years.
Nasal septum: The dividing wall that runs down the middle of the nose, separating the two nasal ' cavities, each of which ends in a nostril. The nasal septum is composed of bone, cartilage, and 'membranes.
One of the transverse partitions dividing the shell of a mollusk, or of a rhizopod, into several chambers. septum (Noun). One of the transverse partitions dividing the body cavity of an annelid. Origin: From septum, alternative form of saeptum, from saeptus, perfect passive participle of saepio.