Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

ectoderm

play
noun ec·to·derm \ˈek-tə-ˌdərm\

Definition of ectoderm

  1. 1 :  the outer cellular membrane of a diploblastic animal (as a jellyfish)

  2. 2 a :  the outermost of the three primary germ layers of an embryo that is the source of various tissues and structures (as the epidermis, the nervous system, and the eyes and ears) b :  a tissue (as neural tissue) derived from this germ layer

ec·to·der·mal play \ˌek-tə-ˈdər-məl\ adjective


Origin of ectoderm

International Scientific Vocabulary


First Known Use: 1859


Medical Dictionary

ectoderm

play
noun ec·to·derm \ˈek-tə-ˌdərm\

Medical Definition of ectoderm

  1. 1:  the outermost of the three primary germ layers of an embryo

  2. 2:  a tissue (as neural tissue) derived from ectoderm

  3. ec·to·der·mal \ˌek-tə-ˈdər-məl\play adjective




Learn More about ectoderm


Seen and Heard

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

WORD OF THE DAY

February 8, 2016

to clear from accusation or blame

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

spindrift kittly-benders pince-nez duvet
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ