What does triploid mean?
Triploid is a technical biological term for a cell or organism possessing three complete sets of chromosomes, rather than the two sets normally found in diploid organisms. The condition is denoted by 3n and is distinct from having only three chromosomes. Triploidy can arise through errors in cell division or through crossing between organisms of different ploidy. In animals, it is often associated with developmental abnormalities and reduced fertility, while in plants it can be deliberately maintained and may produce larger or otherwise distinctive fruits, vegetables, and ornamental varieties. The word is chiefly used in genetics, cytology, agriculture, and plant breeding. It is more precise than saying that something has “three chromosomes,” because a triploid possesses three entire chromosome sets, each containing all the chromosomes required for that species.
Having or relating to three complete sets of chromosomes.
"Genetic testing revealed that the plant was triploid."
Used chiefly in biology, genetics, agriculture, and plant breeding.
An organism or cell having three complete sets of chromosomes.
"The triploid produced viable seeds despite its unusual chromosome number."
The noun often stands alone when an entire organism is meant.
The plural is used when referring to more than one triploid organism or cell.
"Several triploids were identified among the seedlings."
Triploid means three complete chromosome sets—not merely three chromosomes—and is commonly abbreviated 3n.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does triploid come from?
The word was coined within the developing scientific vocabulary of cytology and genetics to describe organisms or cells with three chromosome sets. It combines the Greek-derived prefix tri-, meaning “three,” with the combining form -ploid, which is also found in terms such as haploid and diploid. These related terms became established as biologists developed a systematic vocabulary for classifying organisms by chromosome number.
Related word forms
How triploid is actually used
The term belongs primarily to specialized biological and genetic usage. As an adjective, it usually qualifies a cell, organism, chromosome set, or genome; as a noun, it refers to an organism or cell with three chromosome sets. There are no notable British–US differences.
Easily confused with triploid
A triploid has three chromosome sets, whereas a diploid has the usual two.