Quizzes & Games
Word of the Day
Video
New Words
My Favorites
View your list of saved words.
(You can log in using Facebook.)

rough endoplasmic reticulum

noun

Definition of ROUGH ENDOPLASMIC RETICULUM

: endoplasmic reticulum that is studded with ribosomes

Learn More About

Dictionary: Definition of "rough endoplasmic reticulum"

Seen & Heard

What made you want to look up rough endoplasmic reticulum? Please tell us where you read or heard it (including the quote, if possible).

Test Your Vocabulary

Take Our 10-Question Quiz

Spell It

The commonly misspelled words quiz

Hear It, Spell It »

True or False?

A quick quiz about stuff worth knowing

Take It Now »

Vocabulary Quiz

How strong is your vocabulary?

Take the Quiz »

#6: Flabbergast

: to overwhelm with shock,
surprise, or wonder

See All Top 25 Entries »

Get Our Free Apps

Voice Search, Favorites,
Word of the Day, and More

iPhone | iPad | Android | More

Join Us on FB & Twitter

Get the Word of the Day and More

Facebook | Twitter

The Merriam-Webster
Unabridged Dictionary

Online access to a
legendary resource
Log In or Sign Up »

Learning English?
We can help.

Visit our free site designed
especially for learners and
teachers of English
LearnersDictionary.com »

Our Dictionary,
On Your Devices

Merriam-Webster,
With Voice Search
Get the Free Apps! »

Merriam-Webster's
Visual Dictionaries

The new edition of the
remarkable reference
features 8,000
illustrations.
Learn More »

Join Us

Merriam-Webster
on Twitter »

Merriam-Webster
on Facebook »

Bookstore: Digital and Print

Merriam-Webster references for Mobile, Kindle, print, and more. See all »

Other Merriam-Webster Dictionaries

Webster's Unabridged Dictionary » WordCentral for Kids »

Learner's ESL Dictionary » Visual Dictionary »

Browse the Dictionary

Browse the Thesaurus

Browse the Spanish-English Dictionary

Browse the Medical Dictionary

Browse the Concise Encyclopedia