transitive verb
di·​mid·​i·​ate | \ də̇ˈmidēˌāt \

Definition of dimidiate

 (Entry 1 of 2)

1 archaic : to halve or reduce to the half
2 heraldry : to represent the half of : cut in two : halve


di·​mid·​i·​ate | \ -ēə̇t \

Definition of dimidiate (Entry 2 of 2)

1 : divided into two equal parts : halved
2 biology : consisting of only one half of the normal : seeming to lack one half or to have one part smaller than the other dimidiate elytra that cover only half the abdomen are common among certain families of beetles

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!

History and Etymology for dimidiate

Transitive verb

Latin dimidiatus, past participle of dimidiare, from di- (from dis- apart) + -midiare (from medius mid)


Latin dimidiatus, past participle of dimidiare

Keep scrolling for more

Learn More about dimidiate

Statistics for dimidiate

Cite this Entry

“Dimidiate.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/dimidiate. Accessed 9 December 2019.

Comments on dimidiate

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


contradictory or incongruous words

Get Word of the Day daily email!

Test Your Vocabulary

Semantic Drift Quiz

  • a twisty river
  • Which of the following was once a synonym for fun?
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

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!