What does "extreme unction" mean?

The Catholic sacrament of Anointing of the Sick.

How do you pronounce "extreme unction"?

Pronounced //ɪkˈstɹiːm ˌʌŋk.ʃən//.

Common synonyms include: anointing of the sick, baptism, burial service, chrism, chrismal, chrismation.

/ɪkˈstɹiːm ˌʌŋk.ʃən/ noun

noun ·Rare ·Advanced level

Noun

1
The Catholic sacrament of Anointing of the Sick. uncountable
2
a Catholic sacrament; a priest anoints a dying person with oil and prays for salvation wordnet

From extreme (“to limit, final”) + unction (“anointing”).