What is "laserpitium siler"

Laserwort \La"ser*wort`\ (l[=a]"s[~e]r*w[^u]rt`), n. [L. laser the juice of the laserwort.] (Bot.) Any plant of the umbelliferous genus Laserpitium, of several species (as Laserpitium glabrum, and Laserpitium siler), the root of which yields a resinous substance of a bitter taste. The genus is mostly European.

Laserpitium siler, common name laserwort, is a herbaceous perennial plant belonging to the family Apiaceae.