What is the formal name for an “entry” in an ontology?

Question

I am trying to wrap my head around ontologies and their related counterparts (RDF, OWL, etc.).

My understanding is that an ontology, at the end of the day, really boils down to some database storing objects/entries, where each entry has a set of known attributes as well as relationships to other entries.

If that's true, I'd imagine ontologies lend themselves as perfect candidates for NOSQL graph DBs.

Either way, after all my initial reading, I still haven't found what the formal/official name is for a single "entry" in an ontology. Any ideas? Ditto for what the official names of their attributes and other relationships are. Thanks in advance!