-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.

—Artemus Ward (1834-1867)

If you keep on saying things are going to be bad, you have a good chance of being a prophet.

—Isaac Bashevis Singer (1904-1991),
Polish-born American journalist, writer.
hippomancy (s) (noun) (no pl)
Divination with horses, by their appearances and behaviours: Hippomancy included the understanding of their weighing and stamping.

The Celts kept white horses in consecrated groves, while ancient Germans kept similar steeds in their temples.

Horses were used as omens both good and bad.
The rider is very concerned about which foot
is going out first, the left one or the right one.

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If on leaving the temple at the out-break of hostilities, the horses crossed the temple threshold with the left forefoot first, the prophecy was regarded as an evil omen and the war was abandoned. A horse’s pace was also interpreted.

hydromancy (s) (noun), hydromancies (pl)
Divination or fortune-telling by means of the motions or appearance of water: Hydromancy includes the color, ebb and flow, or ripples of water.

Hydromancy is prophecy by means of any liquids by having a small boy tell what he has seen in the liquid or water.

Hydromancy consists of interpreting the color and patterns of flowing water. Sometimes ripples are studied as stones are dropped into a quiet pool of water.

hyomancy (s) (noun) (no pl)
Divination with wild swine: Hyomancy is a form of foretelling future events by observing hogs, or by the "tongue bone" of hogs.
ichnomancy (s) (noun) (no pl)
Divination by scrutinizing the footprints of an animal or of a person:Iichnomancy involves the interpretations of personality and appearances of people by studying their footmarks, posture, and position.
ichthyomancy (s) (noun) (no pl)
Divination involving the heads or entrails of fish: Since Joe loved to go fishing, he combined his hobby with ichthyomancy by examining the innards of fish for prophetic signs.
iconomancy (s) (noun) (no pl)
Prediction the future by using pictures, icons, or special images: Iconomancy is a divination in which visual representations or little picture or paintings are interpreted.
idolomancy (s) (noun) (no pl)
Divination with idols, figures, or images: The answers given by the utilization of idolomancy may come through dreams, by drawing lots, or anything else that believers may attribute to the power of such images.

indivinable (adjective), more indivinable, most indivinable
Regarding the impossibility of being conjectured or guessed: To prophesy or predict one's future is certainly indivinable because things just might turn out completely different!
kephalonomancy (s) (noun) (no pl)
Divination used by some of the Lombards in which lighted carbon was poured on the baked head of a goat as the names of those who were accused of crimes were called out: If crackling occurred as a name was called during kephalonomancy, it was assumed that the accused was guilty.

The head of an ass was also used in kephalonomancy.

keraunomancy (s) (noun), keraunomancies (pl)
Divination by interpreting thunder and lightning: Keraunomancy is a form of prophecy involving the interpretation of an omen communicated by thunder. 
labiomancy (s) (noun) (no pl)
Divination with lip reading: Labiomancy is a form of prophecy in which the motions and movements of a person's lips are interpreted.
libanomancy, livanomancy, knissomancy (s) (noun) (no pl)
Divination by observing and interpreting incense smoke: Jenny loved burning incense and through libanomancy she thought she would find out what her future would be like.
licanomancy (s) (noun) (no pl)
Divination by the study of reflections in still water: The king believed in licanomancy and told his daughter to take the green gem and find a pool of quiet water, drop the gem into the water, and then she would see the image of her future husband in the water.
lithomancy (s) (noun), lithomancies (pl)
Divination with rocks or stone charms of unusual origin or appearance: Lithomancy, a form of fortune-telling, used meteorites, for exampe, which inspired the diviner with visions or produced sounds that he alone could hear and interpreted as words.
logarithmancy (s) (noun), logarithmancies (pl)
1. Divination, or the art of prophecy by supernatural means, with mathematical logarithms (mathematical notations indicating the number of times quantities can be multiplied by themselves): The fortune teller used logarithmancy as her technique for determining future events.
2. Etymology: from New Latin logarithmus; from Greek logos, "reason, proportion" + Greek arithmos, "number".

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-.