Definition from Wiktionary, the free dictionary
cementer (plural cementers)
- A person who applies cement.
- A substance that cements.
- (figuratively) That which confirms or unites.
2011, Bill Gallaher, The Journey: The Overlanders' Quest for Gold, page 93:
- More than a day of rest, Sunday was a cementer of relationships, a soother of the mind, a comfort to the body and an elixir for the soul.