Standard Lemma guide

separatrix

noun · 7 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

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /sɛpəˈɹeɪtɹɪks/
  • rhymes with -eɪtɹɪks

1

noun

Meaning 1

The ⟨L⟩ or pipe ⟨|⟩ mark formerly used to divide integers from decimals.

Definition source: English Wiktionary via Wiktextract

Usage: historical

Topics: media, publishing, typography

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: pipe, slash

Antonyms: none provided

Broader terms: decimal mark, radix point, point, mark, character, separator

2

noun

Meaning 2

Synonym of decimal point, which replaced such marks.

Definition source: English Wiktionary via Wiktextract

Usage: obsolete

Topics: media, publishing, typography

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: decimal point, which replaced such marks

Antonyms: none provided

3

noun

Meaning 3

The proofreader's mark resembling a slash ⟨ / ⟩ or vertical bar ⟨ | ⟩ placed after a note in the margin to indicate that it should replace the item(s) struckthrough in the running text or to separate it from other margin notes.

Definition source: English Wiktionary via Wiktextract

Topics: media, publishing, typography

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

A terminator: a line on a partially-illuminated surface separating the lit and shaded regions.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

The line between regions having different magnetic fields.

Definition source: English Wiktionary via Wiktextract

Topics: natural-sciences, physical-sciences, physics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

The boundary separating two modes of behavior in a differential equation.

Definition source: English Wiktionary via Wiktextract

Topics: mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

noun

Meaning 7

a punctuation mark (/) used to separate related items of information

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: solidus, slash, virgule, diagonal, stroke

Antonyms: none provided

Broader terms: punctuation, punctuation mark

History

Etymology

Learned borrowing from Latin sēparātrīx, the feminine form of separator (originally owing to an implied līnea (“line”)), from sēparāre (“to divide; to separate”) + -trix (forming female agents). By surface analysis, separate + -trix. First developed as a decimal mark among the medieval Arab mathematicians, whence a shorter variant gave rise to the decimal comma employed by many European countries and their former colonies.