The Collaborative International Dictionary of English v.0.48:

Plane tree \Plane" tree`\ (Bot.)
   Same as 1st Plane.
   [1913 Webster] Planet-stricken

WordNet (r) 3.0 (2006):

plane tree
    n 1: any of several trees of the genus Platanus having thin pale
         bark that scales off in small plates and lobed leaves and
         ball-shaped heads of fruits [syn: plane tree, sycamore,
         platan]

Easton's 1897 Bible Dictionary:

Plane tree
   Heb. 'armon (Gen. 30:37; Ezek. 31:8), rendered "chesnut" in the
   Authorized Version, but correctly "plane tree" in the Revised
   Version and the LXX. This tree is frequently found in Palestine,
   both on the coast and in the north. It usually sheds its outer
   bark, and hence its Hebrew name, which means "naked." (See CHESTNUT.)