Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

ameliorant

noun
ame·​lio·​rant | \ əˈmēlyərənt, -lēə-\
plural -s

Definition of ameliorant

: a substance that aids plant growth primarily by improving the physical condition of the soil

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of ameliorant

1851, in the meaning defined above

History and Etymology for ameliorant

ameliorate + -ant

Keep scrolling for more

Learn More about ameliorant

Share ameliorant

Statistics for ameliorant

Look-up Popularity

Time Traveler for ameliorant

The first known use of ameliorant was in 1851

See more words from the same year

Comments on ameliorant

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

Show Comments  Hide Comments 

WORD OF THE DAY

hamartia

Listen to the pronounciation of hamartia

a flaw that causes the downfall of a hero

Get Word of the Day daily email!

Test Your Vocabulary

A Green Quiz

  • shamrock
  • What is the best definition of green-eyed monster?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Dictionary Devil

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

TAKE THE QUIZ

Love words? Need even more definitions?

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

Words at Play

Ask the Editors

Word Games