IPA: /ˈplæntər/
KK: /ˈplæntər/
A container or device used for growing plants, or a person who plants seeds or manages a plantation.
The gardener placed the flowers in a beautiful planter on the patio.
Planter → It is formed from "plant" (from Old French *planter*, meaning to set in the ground) and "-er" (meaning a person who). A planter is a person who plants or sets something in the ground.
Think of someone who 'sets' ('plant') something in the ground — the '-er' just means a person. A planter is someone who plants.