regulus: meaning, definition, pronunciation and examples
Very LowTechnical (Astronomy, Metallurgy), Literary/Historical
Quick answer
What does “regulus” mean?
A minor king, ruler, or petty prince.
Audio
Pronunciation
Definition
Meaning and Definition
A minor king, ruler, or petty prince; a sovereign of inferior rank. Historically, it also refers to the metallic form of a metal, especially an intermediate product in smelting ores (metallurgy), and is the proper name for the brightest star in the constellation Leo.
In historical and literary contexts, 'regulus' denotes a ruler of a small kingdom or domain. In astronomy, it is the name of the star Alpha Leonis. In metallurgy/chemistry, it refers to the impure metallic mass formed beneath a layer of slag during smelting, or the metallic form of antimony. In zoology, it is the genus name for the goldcrest and firecrest birds.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Pronunciation of the second syllable may vary slightly between /ɡjʊləs/ (UK) and /ɡjələs/ (US).
Connotations
None beyond its technical or historical definitions.
Frequency
Equally rare and specialised in both varieties.
Grammar
How to Use “regulus” in a Sentence
Regulus + of + [domain/ore]the + star/star name + RegulusVocabulary
Collocations
Usage
Meaning in Context
Business
Not used.
Academic
Used in historical texts (Roman history), astronomy papers, and metallurgy/chemistry texts describing smelting processes.
Everyday
Not used. Might be recognised as a star name or a character name (e.g., in Harry Potter).
Technical
Primary domain of use: astronomy (star designation), metallurgy (smelting by-product), chemistry (antimony regulus).
Watch out
Common Mistakes When Using “regulus”
- Using it as a general synonym for 'king' or 'ruler' (it is specifically minor). Pronouncing it as /ˈreɡjʊləs/ (hard 'g') instead of /ˈrɛɡjʊləs/ (soft 'g'). Confusing its astronomical and metallurgical meanings.
FAQ
Frequently Asked Questions
No, it is a very low-frequency word used almost exclusively in technical or specialised historical contexts.
As the proper name for the star Alpha Leonis, the brightest star in the constellation Leo.
No. It is exclusively a noun.
Etymologically, both derive from Latin 'regulus' (little king). In metallurgy, the name was allegorical, as the pure metal was considered the 'king' of the ore, or because antimony regulus forms a starry crystalline pattern reminiscent of a crown.
A minor king, ruler, or petty prince.
Regulus is usually technical (astronomy, metallurgy), literary/historical in register.
Regulus: in British English it is pronounced /ˈrɛɡjʊləs/, and in American English it is pronounced /ˈrɛɡjələs/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None”
Learning
Memory Aids
Mnemonic
Think of a tiny 'regular' king (regulus) ruling a small, 'regular'-sized kingdom, or the 'regular' brightest star in Leo.
Conceptual Metaphor
A MINOR RULER IS A SMALL STAR (both are called 'regulus', one metaphorical, one literal).
Practice
Quiz
In which field would you MOST likely encounter the term 'regulus' referring to a celestial object?