dihydrate: meaning, definition, pronunciation and examples
C2/TechnicalScientific/Technical
Quick answer
What does “dihydrate” mean?
A chemical compound containing two molecules of water per formula unit.
Audio
Pronunciation
Definition
Meaning and Definition
A chemical compound containing two molecules of water per formula unit.
A hydrated crystalline form of a salt or compound, specifically where the water molecules are part of the crystal structure (water of crystallization). Can refer to the substance itself or to the process of forming such a compound.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Spelling is identical. The term is international scientific vocabulary.
Connotations
Purely technical, with no regional cultural connotations.
Frequency
Equally rare in general discourse but standard in relevant scientific fields in both regions.
Grammar
How to Use “dihydrate” in a Sentence
X exists/persists/occurs as a dihydrate.Y crystallises from solution as the dihydrate.Upon heating, the dihydrate dehydrates to the anhydrous form.The dihydrate of Z is more stable in humid conditions.Vocabulary
Collocations
Examples
Examples of “dihydrate” in a Sentence
noun
British English
- The copper(II) sulphate dihydrate is the familiar blue crystalline solid used in schools.
- Upon storage, the anhydrous powder slowly converted back to the dihydrate.
- The mineral gypsum is calcium sulphate dihydrate.
American English
- The most common form found in the lab is the calcium chloride dihydrate.
- The reaction yielded the dihydrate as pale green crystals.
- Analysis confirmed the product was the magnesium citrate dihydrate.
Usage
Meaning in Context
Business
Virtually never used, except potentially in highly technical specifications for chemical products.
Academic
Standard terminology in chemistry, geology, and materials science papers and textbooks.
Everyday
Extremely rare. Would only be used by someone with specific scientific knowledge discussing a relevant topic.
Technical
The primary domain of use. Precise and necessary for describing compound stoichiometry and crystal structure.
Vocabulary
Synonyms of “dihydrate”
Neutral
Weak
Vocabulary
Antonyms of “dihydrate”
Watch out
Common Mistakes When Using “dihydrate”
- Using 'dihydrate' to mean 'very hydrated' or 'wet' in a general sense.
- Confusing it with 'dehydrate'. ('Di-' means two, 'De-' means removal).
- Misspelling as 'dyhydrate'.
- Assuming all hydrates are dihydrates.
FAQ
Frequently Asked Questions
No, it is a specialist scientific term (C2 level). You will only encounter it in chemistry, geology, or related technical contexts.
Extremely rarely. The standard verb is 'hydrate' or 'form a hydrate'. 'Dihydrate' is almost exclusively a noun describing a substance.
'Hydrate' is a general term for any compound containing water molecules. 'Dihydrate' is a specific type of hydrate containing exactly two water molecules per formula unit.
It is pronounced /daɪˈhaɪdreɪt/ (dye-HY-drate), with primary stress on the second syllable ('hy'). The 'di-' is pronounced like 'dye' (as in 'die' or 'dyed').
A chemical compound containing two molecules of water per formula unit.
Dihydrate is usually scientific/technical in register.
Learning
Memory Aids
Mnemonic
Think of 'DI-hydrate' as 'TWO-water' (DI = two, as in dioxide or dioxide; hydrate = water). It's a compound holding hands with two water molecules.
Conceptual Metaphor
The water molecules are 'guests' trapped in the 'host' crystal lattice. The compound is 'holding' or 'carrying' two waters of crystallisation.
Practice
Quiz
What does the prefix 'di-' in 'dihydrate' specify?