- Today's Word
Vestigial
veh-STIJ-ee-uhl
Definition
- (adjective) Relating to a small, remaining part of something that once had a larger presence or function.
- In biology, describing a structure that has lost most or all of its original function through evolution.
Example
The ancient ruins stood as a vestigial reminder of a once-great civilization.
Fun Fact
“Vestigial” comes from the Latin word vestigium, meaning “footprint” or “trace.” Initially referring to physical remnants, it evolved to describe anything lingering or diminished. In evolutionary biology, it describes traits like the human tailbone or appendix, which no longer serve their original purpose but offer fascinating insights into our species’ history.
(verb) To suggest or assume something as a basis for reasoning or argument without prior proof.
The scientist postulated that the mysterious signals were coming from a previously undiscovered layer of the atmosphere, a theory that took years to confirm.
Postulate derives from the Latin postulare, meaning “to demand” or “to claim,” rooted in poscere, meaning “to ask urgently.” In medieval logic and mathematics, a postulate was a foundational assumption that didn’t require proof — something demanded to be accepted as a starting point. Euclid’s famous geometric postulates, written around 300 BCE, are among the most influential examples in intellectual history.