rosinweed [roz-in-weed] Word Origin noun
- any coarse, North American, composite plant of the genus Silphium, having a resinous juice and stalkless, paired leaves.
- the compass plant, S. laciniatum.
Origin of rosinweed An Americanism dating back to 1825–35;+ British Dictionary definitions for rosinweed rosinweed noun
- any of several North American plants of the genus Silphium and related genera, esp the compass plant, having resinous juice, sticky foliage, and a strong smell: family Asteraceae (composites)