We present the LTE abundance analysis of high resolution spectra for red giant
stars in the peculiar bulge globular cluster NGC 6388. Spectra of seven members
were taken using the UVES spectrograph at the ESO VLT2 and the multiobject
FLAMES facility. We exclude any intrinsic metallicity spread in this cluster:
on average, [Fe/H]=-0.44+/-0.01+/-0.03 dex on the scale of the present series
of papers, where the first error bar refers to individual star-to-star errors
and the second is systematic, relative to the cluster. Elements involved in
H-burning at high temperatures show large spreads, exceeding the estimated
errors in the analysis. In particular, the pairs Na and O, Al and Mg
are anticorrelated and Na and Al are correlated among the giants in NGC 6388,
the typical pattern observed in all galactic globular clusters studied so far.
Stars in NGC 6388 shows an excess of alpha-process elements, similar to the
one found in the twin bulge cluster NGC 6441. Mn is found underabundant in
NGC 6388, in agreement with the average abundance ratio shown by clusters of
any metallicity. Abundances of neutron-capture elements are homogeneously
distributed within NGC 6388; the [Eu/Fe] ratio stands above the value found
in field stars of similar metallicity.