/ Dictionary / Index P plane tree: Meaning and Definition of Find definitions for: plane' tree" Pronunciation: [key] any tree of the genus Platanus, esp. P. occidentalis, the buttonwood or sycamore of North America, having palmately lobed leaves and bark that sheds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. planetology plane trigonometry Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language