A prefix used to indicate the enantiomer for natural products and related molecules where the trivial name only refers to one enantiomer, e.g.
ent-kaurene is the enantiomer of kaurene.
Source:
PAC, 1996, 68, 2193. 'Basic terminology of stereochemistry (IUPAC Recommendations 1996)' on page 2208 (https://doi.org/10.1351/pac199668122193)