What does "co-sister" mean?

colleague ("sister" in the same craft, occupation, or society)

What is a synonym for "co-sister"?

Common synonyms include: co-sister-in-law.

noun

noun ·Rare ·Advanced level

Noun

1
colleague ("sister" in the same craft, occupation, or society)
"At the death of the co-sisters of the Guild, every co-brother of the Guild to be present"
2
One's spouse's sibling's wife. India
"During this time I came to know about tubectomy from my co-sister and also from the female health worker. This time both my husband and father-in-law refused [me the surgery] on the ground that I was the eldest daughter-in-law and a responsible person for the whole family."

"At the death of the co-sisters of the Guild, every co-brother of the Guild to be present"

From co- + sister. The second meaning was influenced by a Dravidian substrate.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.