Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
: the outer primary meristem of a plant or plant part
circa 1932, in the meaning defined above
International Scientific Vocabulary
Keep scrolling for more
Resources for protoderm
Time Traveler for protoderm
See more words from the same year
More from Merriam-Webster on protoderm
Britannica.com: Encyclopedia article about protoderm
Comments on protoderm
What made you want to look up protoderm? Please tell us where you read or heard it (including the quote, if possible).
by force of circumstances
Get Word of the Day daily email!
Difficult Vocab Quiz
Can you spell these 10 commonly misspelled words?
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
A common word, but only by a whisker
Semantic bleaching and the power to amaze
Cans of worms, wild-goose chases, and more
Words from the week of 11/16/2018
And is one way more correct than the others?
The story of an imaginary word that managed to sneak past our editors and enter the dictionary.
How to use a word that (literally) drives some people nuts.
The awkward case of 'his or her'
Another round of challenging vocab!
(Secret October WOTD Quiz)
A game of winding words.