Herbicide

[hur-buh-sahyd, ur-] /ˈhɜr bəˌsaɪd, ˈɜr-/

noun
1.
a substance or preparation for killing plants, especially weeds.
/ˈhɜːbɪˌsaɪd/
noun
1.
a chemical that destroys plants, esp one used to control weeds
n.

1888, originally a trademark name, from herb + -cide.
herbicide
(hûr’bĭ-sīd’, ûr’-)
A pesticide used to kill weeds. Paraquat is a herbicide. Compare fungicide, insecticide, rodenticide.

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Herbivore
[hur-buh-vawr, -vohr] /ˈhɜr bəˌvɔr, -ˌvoʊr/ noun 1. a animal. /ˈhɜːbɪˌvɔː/ noun 1. an animal that feeds on grass and other plants 2. (informal) a liberal, idealistic, or nonmaterialistic person n. 1851, from Modern Latin herbivora (1830) or French herbivore (1748), from Latin herbivorus, from herba “a herb” + vorare “devour, swallow” (see voracity). herbivore (hûr’bə-vôr’, […]
Herbivorous
[hur-biv-er-uh s, ur-] /hɜrˈbɪv ər əs, ɜr-/ adjective 1. feeding on plants. /hɜːˈbɪvərəs/ adjective 1. (of animals) feeding on grass and other plants 2. (informal) liberal, idealistic, or nonmaterialistic adj. “plant-eating,” 1660s, from Modern Latin herbivorus, from Latin herba “a herb” + vorare “devour, swallow” (see voracity).
Herb layer
noun 1. See layer (sense 2)

Herb-of-grace
[urb-uh v-greys, hurb-] /ˈɜrb əvˈgreɪs, ˈhɜrb-/ noun, plural herbs-of-grace. Archaic. 1. 2 .
Herbologist
[hur-bol-uh-jee, ur-] /hɜrˈbɒl ə dʒi, ɜr-/ noun 1. the study or collecting of , especially as a hobby. noun the study of herbs in alternative medicine