tiller (n.1)

mid-14c., "stock of a crossbow," from Old French telier "stock of a crossbow" (c. 1200), originally "weaver's beam," from Medieval Latin telarium, from Latin tela "web; loom," from PIE *teks-la-, from root *teks- "to weave," also "to fabricate." Meaning "bar to turn the rudder of a boat" first recorded 1620s.

tiller (n.2)

"one who tills," mid-13c., from till (v.).

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Definitions of tiller from WordNet
tiller (n.)
a shoot that sprouts from the base of a grass;
tiller (n.)
someone who tills land (prepares the soil for the planting of crops);
tiller (n.)
lever used to turn the rudder on a boat;
tiller (n.)
a farm implement used to break up the surface of the soil (for aeration and weed control and conservation of moisture);
Synonyms: cultivator
tiller (v.)
grow shoots in the form of stools or tillers;
Synonyms: stool