knobweedn.

Brit.

/ˈnɒbwiːd/, U.S.

/ˈnɑbˌwid/

Origin: Formed within English, by compounding. Etymons: knob n., weed n.¹

Etymology: < knob n. + weed n.¹; in sense 1 as an etymologizing alteration of knapweed n. With sense 2 compare earlier knotweed, in the same sense (1828 or earlier).

1. Any of several knapweeds, genus Centaurea, having hard globular flower buds; esp. common or black knapweed, C. nigra.

ΘΚΠ

the world > plants > particular plants > plants perceived as weeds or harmful plants > weed > [noun] > knapweed

ironhardOE

matfellon?a1300

hardhawa1400

bull-weeda1450

club-weeda1500

knapweed1530

crop-weed1597

hardhead1610

horse-knop1691

horse-knob1724

buttonweed1760

knobweed1785

ironweed1808

knotweed1827

ironhead1863

1785 T. Martyn tr. J.-J. Rousseau Lett. Elements Bot. xxvi. 404 Common or Black Knap-weed, perhaps more properly Knob-weed.

1802 Communications to Board of Agric. III. 152 Mr. Marshall gives an instance of a meadow, foul in the extreme with knobweed, cured by pasturing it repeatedly in the spring with sheep.

1880 J. Britten & R. Holland Dict. Eng. Plant-names Knobweed (in allusion to the hard, round flower-heads), Centaurea nigra, C. Cyanus, and C. Scabiosa.

1910 A. Silver Brit. Bird Managem. 39/1 Knapweeds.—These plants, called by countryfolk Knobweed, Hardheads, and Ironweed,..are also greatly appreciated by Goldfinches, Siskins, and Linnets.

1982 D. McClintock Guernsey's Earliest Flora 150 Knapweed is Knobweed, from the hard head.

2. U.S. Horsebalm, Collinsonia canadensis. Now rare.Chiefly in lists of alternative names for the plant.

ΘΚΠ

the world > plants > particular plants > plants and herbs > according to family > labiate plant or plants > [noun] > stone-root

stone-root1848

knobweed1852

ox-balm1854

horse-balm1894

1852 Trans. Amer. Med. Assoc. 5 831 Collinsonia Canadensis... Horsebalm; Horseweed; Knobweed; Richweed; Stoneroot, &c.

1888 New Sydenham Soc. Lexicon Knobweed, the Collinsonia canadensis.

2004 D. F. Austin Florida Ethnobot. 227/2 Collinsonia canadensis... knob grass [knobgrass, knob root, knobroot, knob weed, knobweed] (all names alluding to the knotty roots).

This entry has been updated (OED Third Edition, June 2019; most recently modified version published online March 2022).

单词	knobweed
释义	knobweedn. Brit. /ˈnɒbwiːd/, U.S. /ˈnɑbˌwid/ Origin: Formed within English, by compounding. Etymons: knob n., weed n.¹ Etymology: < knob n. + weed n.¹; in sense 1 as an etymologizing alteration of knapweed n. With sense 2 compare earlier knotweed, in the same sense (1828 or earlier). 1. Any of several knapweeds, genus Centaurea, having hard globular flower buds; esp. common or black knapweed, C. nigra. ΘΚΠ the world > plants > particular plants > plants perceived as weeds or harmful plants > weed > [noun] > knapweed ironhardOE matfellon?a1300 hardhawa1400 bull-weeda1450 club-weeda1500 knapweed1530 crop-weed1597 hardhead1610 horse-knop1691 horse-knob1724 buttonweed1760 knobweed1785 ironweed1808 knotweed1827 ironhead1863 1785 T. Martyn tr. J.-J. Rousseau Lett. Elements Bot. xxvi. 404 Common or Black Knap-weed, perhaps more properly Knob-weed. 1802 Communications to Board of Agric. III. 152 Mr. Marshall gives an instance of a meadow, foul in the extreme with knobweed, cured by pasturing it repeatedly in the spring with sheep. 1880 J. Britten & R. Holland Dict. Eng. Plant-names Knobweed (in allusion to the hard, round flower-heads), Centaurea nigra, C. Cyanus, and C. Scabiosa. 1910 A. Silver Brit. Bird Managem. 39/1 Knapweeds.—These plants, called by countryfolk Knobweed, Hardheads, and Ironweed,..are also greatly appreciated by Goldfinches, Siskins, and Linnets. 1982 D. McClintock Guernsey's Earliest Flora 150 Knapweed is Knobweed, from the hard head. 2. U.S. Horsebalm, Collinsonia canadensis. Now rare.Chiefly in lists of alternative names for the plant. ΘΚΠ the world > plants > particular plants > plants and herbs > according to family > labiate plant or plants > [noun] > stone-root stone-root1848 knobweed1852 ox-balm1854 horse-balm1894 1852 Trans. Amer. Med. Assoc. 5 831 Collinsonia Canadensis... Horsebalm; Horseweed; Knobweed; Richweed; Stoneroot, &c. 1888 New Sydenham Soc. Lexicon Knobweed, the Collinsonia canadensis. 2004 D. F. Austin Florida Ethnobot. 227/2 Collinsonia canadensis... knob grass [knobgrass, knob root, knobroot, knob weed, knobweed] (all names alluding to the knotty roots). This entry has been updated (OED Third Edition, June 2019; most recently modified version published online March 2022). < n.1785
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