An extremely rare or archaic term with unclear meaning, possibly related to Earth-based anomalies or irregularities.
From geo- 'earth' + possibly -maly (from Greek anomaly, meaning 'irregularity'). This word is so obscure that it appears in almost no modern references.
This might be one of those words that existed in a single 18th-century scientific text and has haunted dictionaries ever since—a fossil word from when scientific terminology was still being invented!
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