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a combining form meaning “having chromosome sets” of the kind or number specified by the initial element: hexaploid.
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Origin of -ploid

Extracted from haploid, diploid, etc.

Words nearby -ploid

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023


What does -ploid mean?

The combining formploid is used like a suffix meaning “having chromosome sets.” It is occasionally used in scientific terms, especially in biology.

The form –ploid is extracted from the endings of words such as haploid, which means “pertaining to a single set of chromosomes.” The word haploid itself comes from the combination of two forms: hapl, meaning “single”, and oid, meaning “resembling” or “like.”

Examples of -ploid

A scientific term that uses the form –ploid is polyploid, “having a chromosome number that is more than double the basic or haploid number.”

The poly part of the word may look familiar; it means “many,” from Greek polýs. The –ploid part of the word means “having chromosome sets.” Polyploid literally translates to “having many chromosome sets.”

What are some words that use the combining form –ploid?

What are some other forms that –ploid may be commonly confused with?

Break it down!

The combining form penta means “five.” With this in mind, what does pentaploid mean?

How to use -ploid in a sentence

British Dictionary definitions for -ploid


adj combining form, n combining form
indicating a specific multiple of a single set of chromosomesdiploid

Derived forms of -ploid

-ploidy, n combining form

Word Origin for -ploid

from Greek -pl (oos) -fold + -oid
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