The Alveolar consonant reference article from the English Wikipedia on 24-Apr-2004
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Alveolar consonant

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Alveolars are consonants articulated with the tip of the tongue against the alveolar ridge, the internal side of the upper gums (known as the alveoles of the upper teeth).

The alveolar consonants identified by the International Phonetic Alphabet are:

IPA Symbol Name Example Meaning
t Voiceless alveolar plosive English [thæp] tap
d Voiced alveolar plosive English [dɛt] debt
n Alveolar nasal English [ɹʌn] run
r Alveolar trill Spanish [pero] perro (="dog")
ɾ Alveolar flap Spanish [peɾo] pero (="but")
s Voiceless alveolar fricative English [sut] suit
z Voiced alveolar fricative English [zu] zoo
ɬ Voiceless alveolar lateral fricative
ɮ Voiced alveolar lateral fricative
ɹ Alveolar approximant English [ɹu] rue
l Alveolar lateral approximant English [lup] loop

See also