Phrase guide

fifth-day fits

noun · 1 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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1

noun

Meaning 1

Benign idiopathic neonatal seizures, a rare form of seizures that manifests in newborns in the latter part of the first seven days of life.

Definition source: English Wiktionary via Wiktextract

Usage: plural, plural-only

Topics: medicine, pathology, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Most cases of the syndrome have had their onset on the fifth day of life.