In Biblical Hebrew, what is the "internal passive with characteristic u vowel"?
It sounds like you are referring to the adjectival form "qatul", in which the u vowel is inserted between the second and third letters of the root. It denotes the passive of a pa'al verb, usually functioning to modify a noun. For example, etz shatul (Psalms 1).
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It refers to forms like
And also to the extinct qal internal passive, found only rarely and in altered form in Hebrew, e.g. yullad ילד ) יולד), Ruth 4:17.