1. in the primary sense it seems to mean thick : (akin to ἀδ-ινός, as κυδρός to κυδνός):

2. of things, χιόνα ἁδρὴν πίπτουσαν falling thick , (Herdotus Historicus):—; strong , great in any way, ἁδρὸς πόλεμος (Aristophanes Comicus)

3. of persons, large, fine, well-grown , (Herdotus Historicus); of animals, (Xenophon Historicus); of fruit or corn, full-grown, ripe , (Herdotus Historicus) (ML)