-mancy, -mancer, -mantic, -mantical
(Greek: used as a suffix; divination, prophecy, fortune telling; to interpret signs so “practical” decisions can be made [related to -mania])
It isn't so much the things we don't know that gets us into trouble. It's the things we know that aren't so.
If you keep on saying things are going to be bad, you have a good chance of being a prophet.
2. Etymology: from New Latin logarithmus; from Greek logos, "reason, proportion" + Greek arithmos, "number".
Success was indicated by one flame burning brighter than the other two, a wavering flame indicated travel, a spiral flame meant plots by enemies, an uneven flame presaged danger, sparks called for caution, and a sudden extinction indicated severe loss or tragedy for the consultant or others involved in that particular divination.

Go to this Word A Day Revisited Index
so you can see more of Mickey Bach's cartoons.
Happen to be professors,
They're called "prescient prognosticators,"
If not, they're just "lucky guessers."
One ancient use of margaritomancy involved throwing a pearl into a cast iron pot sitting in a fire and watching it to determine a person's guilt or innocence in a crime. If the pearl started to move, then the person was believed to be guilty. If it stayed in place, then he or she was not guilty.
Cross references of word families that are related directly, or indirectly, to: "divination, diviner; seer, soothsayer, prophecy, prophesy, prophet": augur-; auspic-; fa-, fate; Fates in action; futur-; omen; -phemia; sorc-, sorcery; vati-.
A cross reference of other word family units that are related directly, or indirectly, to: "chance, luck, fate": aleato-; auspic-; cad-; fortu-; serendipity; sorc; temer-; tycho-.