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phytotelm
phytotherapy
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PI
pi (1)
pi (2)
pi bond
pi-dog
pi meson
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pi bond

pi bond (plural pi bonds)


noun 
Definition:
 
type of covalent bond: a covalent bond between two atoms and a pair of electrons having orbitals whose greatest overlap is along a plane perpendicular to a line connecting the nuclei of the atoms


pi-bond·ing adjective
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