planet
UK[ˈplænɪt]US[ˈplænɪt]
n
A large, round object in space that moves around a star (such as the sun) and receives light from it.
n
The planet Earth, especially when considered as a place where people live.
Etymology
The word 'planet' originates from the ancient Greek 'planētēs', meaning 'wanderer', derived from the verb 'planasthai' (to wander). This term was applied by Greek astronomers to the seven celestial bodies (including the sun and moon) that appeared to move against the fixed backdrop of stars. Through Latin 'planeta' and Old French 'planete', the term entered English, retaining its core concept of a moving celestial body. Over centuries, as astronomical understanding evolved, the definition narrowed to its modern scientific sense, specifically excluding the sun and moon but preserving the ancient idea of an object in motion through the heavens.
Analysis
The word 'planet' is a simplex loanword from Greek via Latin and Old French. It cannot be meaningfully segmented into productive morphemes in modern English spelling without resorting to etymological roots not present in its current form.
Examples
Jupiter is the largest planet in our solar system.
Scientists are searching for planets that could support life.
We must do more to protect our planet from environmental damage.