fluorescein
noun
Simple meaning
A yellow dye that is visible even when highly diluted.
Pronunciation
Say it like this:
fluurehsahynSay the bold part a little louder.
IPA pronunciation (US)
flʊˈɹɛsaɪn
This word is pronounced essentially the same in American and British English, so one transcription covers both.
IPA (International Phonetic Alphabet) is a standard way of writing speech sounds.
Definition
Everyday modern meanings first, grouped by part of speech.
noun
organic chemistry
A yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed)
organic chemistry
Any of a class of yellow xanthene dyes which are visible when highly diluted; used forensically to detect traces of blood, and in analytical chemistry as an indicator in silver nitrate titrations
Word at a Glance
- Frequency
- Rare
- Formality
- Technical
Share your sentence
Common Patterns and Combinations
How this word naturally appears with others.
Tap the highlighted word to open its own entry.
Word Family
Related forms, grouped by how they connect.
Compound terms
Established multiword terms.
A fluorochrome commonly conjugated with antibodies for use in indirect immunofluorescence.
A fluorochrome commonly conjugated with antibodies for use in indirect immunofluorescence.
More about this wordSynonyms, forms, origin
Synonyms
Sense: yellow dye that is visible even when highly diluted
Ask Vocabaura
Understand the word your way.
What Does It Mean Here?
Words can change meaning depending on context.
Use it yourself
Keep learning “fluorescein” by choosing the kind of practice you need next.
- Practice sentence writingWrite sentences with vocabulary and get instant feedback.
- Practice in contextAnswer short vocabulary questions drawn from real situations.
- Review vocabularyTest your recall and strengthen words over time.
- Practice typingType vocabulary in short rounds that draw from words you've learned and saved.
Want to type words like this one without looking at the keyboard? Each typing round draws from words you've learned, saved or need to review. Follow the free Learn to Type lessons and type your own vocabulary with confidence.
Dictionary data from Wiktionary via the Free Dictionary API. Simple meanings, combinations and word intelligence are built from verified reference data, no AI is used to load this page.