Phrase guide

optic axis

noun · 4 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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No pronunciation record was provided for this word.

1

noun

Meaning 1

The optical axis.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

The direction in which a ray of light passing through a crystal does not suffer double refraction.

Definition source: English Wiktionary via Wiktextract

Topics: chemistry, crystallography, geography, geology, mineralogy, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted

Definition source: Princeton WordNet 3.0

Examples

  • in a normal eye the optic axis is the direction in which objects are seen most distinctly

Meaning relationships

Synonyms: principal axis

Antonyms: none provided

Broader terms: axis

4

noun

Meaning 4

in a doubly refracting crystal, the line in the direction of which no double refraction occurs

Definition source: Princeton WordNet 3.0

Examples

  • a crystal may have either one or two optic axes

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: axis

History

Etymology

No etymology was provided for this word.