adjective amor·phous \ ə-ˈmȯr-fəs \
|Updated on: 6 Aug 2018

Definition of amorphous

1 a : having no definite form : shapeless
  • an amorphous cloud mass
b : being without definite character or nature : unclassifiable
  • an amorphous segment of society
c : lacking organization or unity
  • an amorphous style of writing
2 : having no real or apparent crystalline form
  • an amorphous mineral





Examples of amorphous in a Sentence

  1. Astronomers think our solar system took shape when an amorphous interstellar cloud of dust and gas collapsed under its own weight. The conservation of angular momentum, or spin, kept some of the material from simply falling all the way to the newborn sun; instead it settled into a pancake shape. —Michael W. Werner et al.Scientific AmericanJune 2009
  2. Most library and academic accrediting associations either ignore weeding or have general, rather amorphous, standards. Among the more specific standards are those of the American Library Associations' 1967 public library systems standards, which suggest annual weeding of at least 5 percent of "community collections," with headquarters libraries weeding more cautiously … LJ Special Report1990
  3. A quarter of a century ago, author Betty Friedan stumbled upon a "problem that has no name."" Middle-class American women were prisoners of gilded cages, she argued, unfulfilled by their exclusive roles as wives and mother. Friedan gave the amorphous problem, and the book that described it, a name—"The Feminine Mystique"—and with it helped launch one of the most transforming social movements in modern history." —Eloise Salholz et al.Newsweek31 Mar. 1986
  4. Oblivious to all the attention, the big cat calmly sashayed to a concave little hollow scooped out of an artificial granite cliff-side at the rear of her cage. There, her four sleeping, newborn cubs were nestled one atop another so tightly that they formed one amorphous lump of fur. —Jon LuomaAudubonNovember l982
  5. an amorphous segment of society

  6. amorphous lumps of clay magically transformed by a skilled potter's hands into works of art

Recent Examples of amorphous from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'amorphous.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of amorphous

Greek amorphos, from a- + morphē form

Other Mineralogy Terms

AMORPHOUS Defined for English Language Learners


Definition of amorphous for English Language Learners

  • : having no definite or clear shape or form

Medical Dictionary


adjective amor·phous \ ə-ˈmȯr-fəs \

medical Definition of amorphous

1 : having no apparent shape or organization
2 : having no real or apparent crystalline form

Seen and Heard

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

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!


fullness to the point of excess

Get Word of the Day daily email!

Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet-pasta-spelling-help
  • Which is the correct spelling?
Spell It

Can you spell these 10 commonly misspelled words?


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


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!