What does “Plantcestor” mean?

❤ PLANT·CES·TOR (aka. PLANT·CES·TAR) \noun\ plant-ses-tər also -səs-\  : an ancient living organism of the kind exemplified by trees, shrubs, herbs, grasses, ferns, and mosses, who live through absorbing water and the soil’s minerals through their roots, sunlight/starlight/moonlight/cosmic energy through their leaves, and the carbon-dioxide exhaled by humans and other mammals which they transform into oxygen.…