CULTIVATOR
cultivator, tiller
(noun) a farm implement used to break up the surface of the soil (for aeration and weed control and conservation of moisture)
agriculturist, agriculturalist, cultivator, grower, raiser
(noun) someone concerned with the science or art or business of cultivating the soil
Source: WordNet® 3.1
Etymology
Noun
cultivator (plural cultivators)
Any of several devices used to loosen or stir the soil, either to remove weeds or to provide aeration and drainage.
A person who cultivates.
Source: Wiktionary
Cul"ti*va`tor (kl"t-v`tr), n. Etym: [Cf. F. cultivateur.]
1. One who cultivates; as, a cultivator of the soil; a cultivator of
literature. Whewell.
2. An agricultural implement used in the tillage of growing crops, to
loosen the surface of the earth and kill the weeds; esp., a
triangular frame set with small shares, drawn by a horse and by
handles.
Note: In a broader signification it includes any complex implement
for pulverizing or stirring the surface of the soil, as harrows,
grubbers, horse hoes, etc.
Source: Webster’s Unabridged Dictionary 1913 Edition