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Orbital Or  Noun  A Atom Molecule Reference Adjective

Title orbital
Text
Merriam-Webster's Collegiate Dictionary
orbital
noun
 ETYMOLOGY  orbital, adjective
 DATE  1932
: a mathematically described region around a nucleus in an atom or molecule that may contain zero, one, or two electrons
English Etymology
orbital
  1540s, with reference to eye sockets; 1839 with reference to heavenly bodies; from orbit.
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
orbital
or·bit·al 5C:bitlNAmE 5C:rb- / adjective[only before noun] 
1. connected with the 
orbit
 of a planet or object in space
   (行星或空间物体)轨道的
2. (BrE(of a road 道路) built around the edge of a town or city to reduce the amount of traffic travelling through the centre
   (城市)外环路的noun   (BrEa very large ring road , especially if it is a 
motorway
 
   高速环行路:
   the M25 London orbital 
   伦敦 M25 高速环行路 
Webster's Third New International Dictionary, Unabridged
Search result show the entry is found in: orbital arch , or orbital electron , or orbital fissure , or orbital fossa , or orbital index , or orbital lobe , or orbital moment , or orbital nerve , or orbital point , or orbital process , or orbital quantum number , or molecular orbital, or p orbital

or·bit·al
I. \ˈȯ(r)bəd.əl, -bətəl\ adjective
Etymology: orbit (I) + -al
1. : of or relating to an orbit
 orbital revolution >
2. : 
ocular
 < an orbital scale >
II. noun
(-s)
1. : a solution of the Schrödinger wave equation describing a possible mode of motion of a single electron in an atom or molecule
2. : the state that is described by the orbital

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