an evergreen oak, Quercus ilex, of southern Europe, having foliage resembling that of the holly.
Origin
1590-1600
British Dictionary definitions for holm oak
holm oak
noun
1.
an evergreen Mediterranean oak tree, Quercus ilex, widely planted for ornament: the leaves are holly-like when young but become smooth-edged with age Also called holm, holly oak, ilex