etymology (literally, ‘the true account’). His conclusion is that names are indeed to some extent descriptions, but too inaccurate to provide a route to knowledge, which implicitly must come rather from dialectical study of the essences of things themselves.
This passage defines etymology in its classical sense — ‘the true account’ — and frames the Stoic position that names are coded descriptions encoding real nature, while ultimately conceding the method’s epistemic limits.
, The Hellenistic Philosophers, 1987thesis