The Liquid consonant reference article from the English Wikipedia on 24-Jul-2004
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Liquid consonant

Helping orphans the way you would do it
Manners of articulation
Nasal consonant
Stop consonant
Fricative consonant
Lateral consonant
Approximant consonant
Semivowel
Liquid consonant
Flap consonant
Trill consonant
Ejective consonant
Click consonant
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Liquid consonants, or liquids, are speech sounds; more specific, they are approximant consonants that are not classified as semivowels (glides) because they do not correspond phonetically to specific vowels (in the way that, for example, the initial [j] in English yes corresponds to [i]). The class of liquids can be divided into lateral liquids and rhotics.

[l] and [r] are typical liquids.

See Phonetics, Stop consonant, Fricative, Affricate.