trihydrate
C2Technical/Scientific
Definition
Meaning
A chemical compound containing three molecules of water per molecule of the primary substance.
Used in chemistry to specify the degree of hydration, indicating the material incorporates three water molecules into its crystalline structure. More broadly, can sometimes refer to the hydrated form of a substance with exactly three H₂O units.
Linguistics
Semantic Notes
A specific term from chemistry, formed via number prefix 'tri-' + 'hydrate'. It denotes a precise stoichiometric relationship. Often part of a chemical name (e.g., 'aluminium trihydrate', 'sodium phosphate trihydrate').
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling and chemical nomenclature conventions are identical.
Connotations
Purely technical, with no cultural or regional connotations.
Frequency
Equally rare outside technical contexts in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
[Chemical Name] + trihydratethe trihydrate of + [Chemical Name]Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Potentially in pharmaceutical, chemical manufacturing, or materials science industries when specifying product forms.
Academic
Common in chemistry, pharmacology, materials science, and geology research papers and textbooks.
Everyday
Virtually never used.
Technical
The primary domain of use. Precise specification in chemical formulas, patents, lab reports, and safety data sheets.
Examples
By Part of Speech
adjective
British English
- The trihydrate crystals were filtered and dried.
- We need the trihydrate specification for the order.
American English
- The trihydrate form is more stable under these conditions.
- Check the label for the trihydrate compound.
Examples
By CEFR Level
- This medicine contains aluminium trihydrate.
- The blue crystals are copper sulfate trihydrate.
- The compound precipitates as a fine white trihydrate.
- For this reaction, you must use the trihydrate, not the anhydrous salt.
- Characterisation by XRD confirmed the product was exclusively the trihydrate phase.
- The trihydrate loses its water of crystallisation upon heating to 120°C.
Learning
Memory Aids
Mnemonic
Think 'TRI-cycle' has three wheels, 'TRI-hydrate' has three water molecules.
Conceptual Metaphor
WATER AS A COMPONENT/CO-PASSENGER: The water molecules are integral parts of the compound's structure, not just loosely attached.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating as 'трёхводный' directly in formal contexts; the standard chemical term is 'тригидрат'.
- Do not confuse with 'trihydro-' prefixes which refer to three hydrogen atoms, not water molecules.
Common Mistakes
- Mispronouncing as /trɪˈhaɪdreɪt/ (short 'i') instead of /traɪˈhaɪdreɪt/ (long 'i').
- Using it as a verb (e.g., 'to trihydrate').
- Confusing it with 'trihydroxide' (e.g., Al(OH)₃).
Practice
Quiz
What does the prefix 'tri-' in 'trihydrate' specifically refer to?
FAQ
Frequently Asked Questions
No, it is a specialised technical term used almost exclusively in chemistry and related scientific fields.
No, it is a noun or adjective. The process is 'hydration'; to specify three waters, you would say 'form the trihydrate' or 'become trihydrated'.
'Trihydrate' means containing three water molecules per formula unit. 'Anhydrous' means containing no water at all.
It is typically written as 'Chemical Formula · 3H₂O'. For example, copper(II) sulfate trihydrate is CuSO₄ · 3H₂O.