Lewis Short
Hēlĭădĕs (noun F) : Ἡλιάδες
* Daughters of Helios and sisters of Phaëthon, who were changed into poplars (acc. to others, into alders) and their tears into amber, Hyg. Fab. 154; Ov. M. 2, 340 (cf. Verg. A. 10, 190, with id. E. 6, 62): nemus Heliadum, i. e. poplar- or alder-grove, Ov. M. 10, 91: Heliadum lacrimae,i. e. amber,id. ib. 10, 263; called also: Heliadum gemma,Mart. 9, 14, 6; hence: capaces Heliadum crustae,i. e. of amber,Juv. 5, 38.
Charlton T. Lewis, Charles Short, A Latin Dictionary