protophloem
noun
pro·to·phlo·em ˌprō-tə-ˈflō-ˌem 
: the first-formed phloem that develops from procambium, consists of narrow thin-walled cells, and is usually associated with a region of rapid growth
Word History
First Known Use
1884, in the meaning defined above
- somatosensory
- somatosplanchnic
- somatostatin
- somatostatins
- somatotrophin
- somatotrophins
- somatotropic hormone
- somatotropin
- somatotropins
- somatotype
- somatotyped
- somatotypes
- somatotyping
- somatotypology
- somber
- somberer
- somberest
- somberlier
- somberliest
- somberly
- somberness
- sombernesses
- sombra
- sombre
- sombrelier