bivalent

/'dai'veilənt/

Definition

Adjective:
- In chemistry: Having a valence of two; capable of combining with two atoms of hydrogen or their equivalent.
- In genetics: Used to describe homologous chromosomes associated in pairs during synapsis in the first meiotic division.

Usage and Examples

Chemistry context:
- Oxygen is a bivalent element, often forming compounds like H₂O.
- The bivalent metal ion readily bonded with two chloride ions.
Genetics/Biology context:
- During prophase I, bivalent chromosomes are clearly visible under the microscope.
- The number of bivalents corresponds to the haploid number of the organism.

Advanced Usage

"Bivalent vaccine": A vaccine designed to protect against two different strains of a pathogen or two different diseases.
- The new bivalent booster targets both the original virus and the Omicron variant.
"Bivalent logic": A less common term referring to classical two-valued logic (e.g., true/false), though "binary" is more standard.
- The system operates on bivalent logic, where every statement is either true or false.

Variants and Related Words

Bivalence (n): The state or condition of being bivalent.
- The bivalence of the atom determines its bonding behavior.
Divalent (adj): A synonym in chemistry, meaning having a valence of two. (Note: "Divalent" is more common in modern chemical nomenclature).
- Calcium is a divalent cation (Ca²⁺).
Univalent (adj): Having a valence of one. (Antonym in chemistry).
- Sodium is a univalent ion (Na⁺).
Multivalent (adj): Having a valence of more than two, or having multiple values or meanings.
- The antibody was multivalent, binding to several different antigens.

Synonyms

Antonyms

Monovalent / Univalent: (Chemistry) Having a valence of one.
Multivalent / Polyvalent: (Chemistry) Having a valence of more than two.
Univalent: (Genetics) Not associated in a pair; referring to unpaired chromosomes.

Adjective

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