'Plantae' originates from Latin, specifically the word 'planta' meaning 'a plant, sprout' (Latin plural form 'plantae').

'Plantae' was adopted from Latin (scientific and botanical Latin) into modern biological nomenclature and used in English to name the plant kingdom.

Initially in Latin it simply meant 'plants' or 'sprouts'; over time it came to be used as the formal name for the taxonomic kingdom of plants in modern scientific usage.