- Today's Word
Deleterious
[del-uh-TEER-ee-us]
Definition
- (adjective) Harmful, damaging, or having a detrimental effect on someone’s health, well-being, or situation. It describes something that causes gradual or subtle harm, often in ways that might not be immediately obvious.
Example
The scientist’s research showed that lack of sleep has a deleterious effect on both mental performance and physical health, even if people don’t notice it right away.
Fun Fact
“Deleterious” comes from the Greek word “dēlētērios,” meaning “noxious” or “harmful,” which itself derives from “dēleisthai,” meaning “to hurt” or “to damage.” The word first appeared in English during the 1640s, primarily in medical texts discussing harmful substances or conditions. Interestingly, in ancient Greek medicine, physicians used this term specifically to describe poisons that worked slowly and imperceptibly, distinguishing them from acute toxins that caused immediate harm. This subtle distinction continues in modern usage, where “deleterious” often implies gradual or cumulative damage rather than sudden harm. The word gained broader use during the Industrial Revolution when scientists and reformers needed precise language to describe the harmful effects of various industrial practices on public health. Today, it’s frequently used in scientific, medical, and environmental contexts to describe subtle but significant negative impacts.
(verb) To speak falsely or maliciously about someone; to misrepresent or defame
The tabloid had traduced the actress so thoroughly that even her closest colleagues began to doubt her.
Traduce derives from the Latin traducere — from trans (“across”) + ducere (“to lead”) — meaning literally “to lead across” or “to parade before others.” In Roman usage it carried the sense of publicly displaying someone to their shame, leading them in disgrace before a crowd. It entered English in the 16th century carrying that same sense of deliberate, public humiliation through false representation.