As Hakase said, words mean what they are used to mean, so in this case it is either a tidbit of true information or a false, but truth-resembling fact.
For further explanation, the suffix “oid” is Latin (borrowed from Greek) for “in the form of” or “in the likeness of,” as in android (man-like) or asteroid (star-like), but it can also mean “pertaining to” as in myeloid cells- cells that come from bone marrow: muelos (marrow) + oid (relating to).
As Hakase said, words mean what they are used to mean, so in this case it is either a tidbit of true information or a false, but truth-resembling fact.
https://en.m.wikipedia.org/wiki/Factoid
For further explanation, the suffix “oid” is Latin (borrowed from Greek) for “in the form of” or “in the likeness of,” as in android (man-like) or asteroid (star-like), but it can also mean “pertaining to” as in myeloid cells- cells that come from bone marrow: muelos (marrow) + oid (relating to).