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planchette
Planck length
Planck’s constant
plane (1)
plane (2)
plane (3)
plane (4)
plane angle
plane geometry
plane sailing
plane table
plane tree
planeload
planer
planer tree
planet
planet wheel
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planetology
plan·e·tol·o·gy [ plànnə tólləjee ]


noun 
Definition:
 
study of planets: the branch of astronomy that studies the origin and composition of the planets and other solid bodies in the solar system such as comets and meteors

plan·e·to·log·i·cal [ plànnətə lójjik'l ] adjective
plan·e·tol·o·gist noun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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