1. variant of chlor- 1 before a consonant:



  1. variant of chlor- 2 before a consonant:




  1. indicating the colour green


  2. chlorine


“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

Discover More

Example Sentences

Chloro-percha, gutta-percha, and oxychlorid of zinc are much better for this purpose.

Chloro-bromo-iodide of silver has also been recognized as a mineral and called iodembolite.

The chloride and chloro-bromide have been found in several Cornish mines, but never in very large amounts.

A chloro-fluoride, PbClF, is obtained by adding sodium fluoride to a solution of lead chloride.

The chloro-, bromo-, iodo-, sulpho- and nitro-compounds show very little effect as a rule.


Discover More

Words That Use Chloro-

What does chloro- mean?

Chloro- is a combining form used like a prefix that can mean “green” or indicate the chemical element chlorine. It is used in many medical and scientific terms, especially in biology and chemistry.

Chloro- comes from the Greek chlōrós, meaning “light green” or “greenish yellow.” Chlorine is so named because the gas has a pale green color.

Chloro- is a variant of chlor-, as in chloranil, used when combined with words or word elements beginning with a consonant. However, in chemistry, chlor- is also often combined to words or word elements beginning with consonants.

Want to know more? Read our Words That Use chlor article.

Examples of chloro-

A word you are likely familiar with that features chloro- is chlorophyll, “the green coloring matter of leaves and plants.”

As we know, the first part of the word, chloro-, means “green.” The second part of the word, phyll, means “leaf,” from the Greek phýllon. The word chlorophyll, then, literally translates to “green leaf.” How sensible!

What are some words that use the combining form chloro-?

What are some other forms that chloro- may be commonly confused with?

Break it down!

What elements do chemical compounds known as chlorocarbons always contain?