A hypothetical or invented form of divination, possibly involving disease, earth, or the interpretation of sickness omens.
Hypothetical coinage from Greek 'egro-' (possibly relating to sick/sore) or Latin 'ager' (field/land) plus '-mancy' (divination); likely a constructed term.
'-Mancy' words are fun to build (necromancy, geomancy, pyromancy)—but egromancy isn't in real dictionaries, showing that not every word you can construct follows the Greek suffix rules actually gets used or survives.
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