selenium: meaning, definition, pronunciation and examples
C2Technical/Scientific
Quick answer
What does “selenium” mean?
A chemical element (Se) with atomic number 34, a nonmetal with properties intermediate between sulphur and tellurium, used in electronics, glassmaking, and some dietary supplements.
Audio
Pronunciation
Definition
Meaning and Definition
A chemical element (Se) with atomic number 34, a nonmetal with properties intermediate between sulphur and tellurium, used in electronics, glassmaking, and some dietary supplements.
The term can refer to the element itself, its compounds, or the technology (e.g., Selenium WebDriver) used for automating web browsers for testing purposes.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning. Pronunciation follows national norms for Latin/Greek-derived scientific terms (see IPA). Spelling is identical.
Connotations
Identical technical/scientific connotations in both varieties.
Frequency
Equally low-frequency in general discourse but used in identical technical contexts in both regions.
Grammar
How to Use “selenium” in a Sentence
[noun] contains selenium[verb] a test using Selenium[adj] - selenium-rich soilVocabulary
Collocations
Examples
Examples of “selenium” in a Sentence
adjective
British English
- The selenium-coated layer was analysed.
- selenium-based supplements
American English
- A selenium-contaminated site.
- selenium-free glass
Usage
Meaning in Context
Business
Rare, except in specific industries like nutritional supplements ('selenium-enriched yeast') or tech/QA ('We use Selenium for regression testing').
Academic
Common in chemistry, biochemistry, materials science, and environmental science papers.
Everyday
Very rare. Possibly encountered on dietary supplement labels or in discussions about soil/nutrition.
Technical
High frequency in two domains: 1) Chemistry/Metallurgy. 2) Software Quality Assurance/Test Automation.
Vocabulary
Synonyms of “selenium”
Neutral
Weak
Watch out
Common Mistakes When Using “selenium”
- Misspelling as 'silenium' or 'selinium'.
- Confusing its chemical role with that of silicon.
- In software contexts, incorrectly capitalising when referring to the element (should be lowercase).
FAQ
Frequently Asked Questions
No, selenium is a nonmetal, though it has some metallic allotropes and shares properties with sulphur and tellurium.
There is no chemical connection. The software tool was named as a joke by its creator, Jason Huggins, in response to a competitor named 'Mercury' (another element), continuing the theme.
Yes, it is an essential trace mineral required in small amounts for proper antioxidant function and thyroid health.
In British English: /sɪˈliː.ni.əm/ (sih-LEE-nee-um). In American English: /səˈliː.ni.əm/ (suh-LEE-nee-um). The stress is always on the second syllable.
A chemical element (Se) with atomic number 34, a nonmetal with properties intermediate between sulphur and tellurium, used in electronics, glassmaking, and some dietary supplements.
Selenium is usually technical/scientific in register.
Learning
Memory Aids
Mnemonic
SELENium sounds like 'moon' (Selene, the Greek moon goddess). Think of a 'celestial' element discovered shortly after tellurium (named for Earth).
Conceptual Metaphor
As a nutrient: A SHIELD/DEFENDER (protects cells from oxidative damage). As a tool: A ROBOT/AUTOMATED WORKER (performs repetitive browser tasks).
Practice
Quiz
In which of these contexts is the word 'selenium' LEAST likely to be used?