Anomaly
An anomaly is a broad term for an irregular phenomenon. Any object or event which deviates from what is ordinarily expected - whether it is in space or within a humanoid body - can be called an anomaly.

The Bajoran wormhole was known as "the anomaly" to the Jem'Hadar. ()

According to Lieutenant Jadzia Dax, an anomaly could be so small that sensors couldn't detect it. ()

Types of anomalies 
Gaseous anomaly
Protein anomaly
Spatial anomaly
Subspace anomaly
Temporal anomaly
Topological anomaly
Celestial objects