atactic

[ey-tak-tik]
adjective Chemistry.
(of a polymer) not stereospecific; lacking tacticity.

Origin:
1955–60; a-6 + -tactic, back formation from tacticity

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atactic (eɪˈtæktɪk)
 
adj
1.  chem (of a polymer) having random sequence of the stereochemical arrangement of groups on carbon atoms in the chain; not stereospecific
2.  pathol relating to or displaying ataxia

ataxia or ataxy (əˈtæksɪə, əˈtæksɪ)
 
n
pathol lack of muscular coordination
 
[C17: via New Latin from Greek: lack of coordination, from a-1 + -taxia, from tassein to put in order]
 
ataxy or ataxy
 
n
 
[C17: via New Latin from Greek: lack of coordination, from a-1 + -taxia, from tassein to put in order]
 
a'taxic or ataxy
 
adj
 
a'tactic or ataxy
 
adj

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Example sentences
These spasms were followed by atactic, paretic and splaying hind limbs.
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