Routledge Dictionary of Language and Linguistics
Secondary articulation is said to occur when, during the articulation of a speech sound, the airstream must bypass a second obstruction in the resonance chamber. Types of secondary articulation are as follows: (a) Labialization: an occlusion, approaching or rounding of the lips, e.g. [∫] vs [∫] in Engl.
[∫ut] shoot; 
vs 
in Abkhazi-Adyge 
‘ten’; 
vs [k] and [p] in the Bantu language Lingala 
‘manioc root.’ (b) Palatalization: the front of the tongue approaching the front of the hard palate, e.g. 
vs [m] in Russian 
‘knead,’ 
‘mother’; [ø:] vs [o:] in German [‘bø:gŋ] ‘bows.’ (c) Velarization: the back of the tongue approaching the back part of the velum, e.g. [ł] vs 
in Russ. 
‘onion’ vs [ļuk] ‘hatch.’ (d) Pharyngealization: the root of the tongue approaching the back wall of the throat, e.g. 
vs [s] in Egyptian Arabic 
‘summer’ vs [se:f] ‘sword.’ (
also articulatory phonetics)
References
phonetics
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