diagnosis (English)

Where does "diagnosis" come from?

The English noun 'diagnosis' comes from the Latin 'diagnōsis'[1], which is derived from the Ancient Greek 'diágnōsis'[1]. This Greek term is built from the elements 'diá' meaning 'through' and 'gignṓskō' meaning 'to know'[1], originating from the earlier verb 'diagignṓskō' meaning 'to discern' or 'distinguish'[1][2]. The ultimate root traces back to the Proto-Indo-European '*ǵneh₃-' meaning 'to know'[3].

Open questions

The ultimate ancestral root is reconstructed as '*ǵneh₃-' with a reduplicated present stem '*ǵiǵneh₃-' in Proto-Hellenic. [3]

Full etymology tree

diagnosis (English), 'The process of, or an instance of, identification of the nature and cause of a medical condition or illness.'
- borrowed diagnōsis (Latin)
  - inherited διάγνωσις (diágnōsis) (Ancient Greek), 'distinguishing'
    - derived διαγιγνώσκω (diagignṓskō) (Ancient Greek), 'to distinguish, discern'
      - prefix δια- (diá-) (Ancient Greek), 'in different directions'
      - derived γιγνώσκω (gignṓskō) (Ancient Greek), 'to be aware of; to perceive, observe, know, learn'
        inherited *gignṓskō (Proto-Hellenic)
        inherited *ǵiǵneh₃- (Proto-Indo-European)
        derived *ǵneh₃- (Proto-Indo-European), 'to recognise, to know'
        suffix -σκω (Proto-Indo-European)
    - suffix -σις (-sis) (Ancient Greek), 'Added to verb stems to form abstract nouns or nouns of action, process, or result'

Ancestors

*ǵneh₃- (Proto-Indo-European)
διάγνωσις (Ancient Greek)

Descendants and derived words

astrodiagnosis (English)
autodiagnosis (English)
biodiagnosis (English)
clinical diagnosis (English)
coprodiagnosis (English)
cytodiagnosis (English)
diagnonsense (English)
diagnose (English)
diagnostic (English)
diagnostic (English)
diagnostics (English)
differential diagnosis (English)

Sources

Updated September 2026

More words starting with D

Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris