[ uh-mawr-fuhs ]
See synonyms for amorphous on
  1. lacking definite form; having no specific shape; formless: the amorphous clouds.

  2. of no particular kind or character; indeterminate; having no pattern or structure; unorganized: an amorphous style; an amorphous personality.

  1. Petrography, Mineralogy. occurring in a mass, as without stratification or crystalline structure.

  2. Chemistry. not crystalline.

  3. Biology. having structural components that are not clearly differentiated, as the nuclear material in certain bacteria.

Origin of amorphous

First recorded in 1725–35, amorphous is from the Greek word ámorphos shapeless. See a-6, -morph, -ous

Other words for amorphous

Other words from amorphous

  • a·mor·phous·ly, adverb
  • a·mor·phous·ness, noun

Words Nearby amorphous Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use amorphous in a sentence

British Dictionary definitions for amorphous


/ (əˈmɔːfəs) /

  1. lacking a definite shape; formless

  2. of no recognizable character or type

  1. (of chemicals, rocks, etc) not having a crystalline structure

Origin of amorphous

C18: from New Latin, from Greek amorphos shapeless, from a- 1 + morphē shape

Derived forms of amorphous

  • amorphism, noun
  • amorphously, adverb
  • amorphousness, noun

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for amorphous


[ ə-môrfəs ]

  1. Not made of crystals. Glass, amber, and plastics are amorphous substances.

  2. Lacking definite form or shape.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.