any polygonaceous plant of the genus Polygonum, having stems with knotlike joints and spikes of small white, green, or pink flowers
Also called (obsolete): polygony. See also knotgrass, bistort, prince's feather (sense 2)
Word origin
C18: New Latin, from Greek polugonon knotgrass, from polu-poly- + -gonon, from gonu knee
Examples of 'lignum' in a sentence
lignum
The content of urushiols, however, was highest in bark, but there was a trace amount in lignum.
Jae Young Jang, Hyeji Shin, Jae-Woong Lim, Jong Hoon Ahn, Yang Hee Jo, Ki Yong Lee,Bang Yeon Hwang, Sung-Ju Jung, So Young Kang, Mi Kyeong Lee 2018, 'Comparison of antibacterial activity and phenolic constituents of bark, lignum, leavesand fruit of Rhus verniciflua.', PLoS ONEhttp://europepmc.org/articles/PMC6059415?pdf=render. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)