Kinktionary
More like guidelines and a lot less like definitions.
Under Protection
Someone who is protected by someone else during their BDSM journey. Usually this person is a trusted friend that can talk them through BDSM concepts, help to vet potential play partners, and generally be there as a guide and confidant to assist and look out for them. This can be in person or online. This type of relationship is usually non-sexual and non-romantic.