Syndrome
Etymology
From Greek syndrome, "a running together," combining syn-, "together," with a root meaning "to run" (as in "dromedary," a runner). The literal picture is of things running alongside one another. In medicine it names symptoms that keep company — appearing as a set. That is why so many conditions are "syndromes": we spotted the pattern before we found the single cause.
noun · /SIN-drohm/
A cluster of symptoms that reliably occur together, recognized as a pattern even when the underlying cause is unclear.
What it names
How doctors name a recognizable problem before they fully understand it — the pattern is real even if the mechanism is not yet known.
Example
The cluster of fatigue, aching, and brain fog was grouped together and given a syndrome name.
Related idea
Pathology asks what is actually going wrong; a syndrome just names the recurring pattern of signs.