Full Idea
Many writers identify essentialism with the belief in 'de re' necessary truths
Clarification
'De re' truths are about reality, as opposed to being about descriptions
Gist of Idea
Essentialism is often identified with belief in 'de re' necessary truths
Source
Thomas Mautner (Penguin Dictionary of Philosophy [1996], p.179)
Book Reference
Mautner,Thomas: 'Dictionary of Philosophy' [Penguin 1997], p.179
A Reaction
I like essentialism, but I cautious about this. If I accept that I have an essential personal identity as I write this, but that it could change over time, the same principle might apply to other natural essences.