The compound adjective 'water-loving' is a modern English formation built from two native Germanic roots. 'Water' descends from the Proto-Indo-European root 'wodr̥-', a neuter noun for the vital liquid, which evolved into the Proto-Germanic 'watōr'. 'Loving' originates from the PIE root 'leubh-', meaning 'to care, desire, love', which became the Old English verb 'lufian'. The compound logically combines these elements to create a descriptive term, primarily used in scientific and horticultural contexts, to denote organisms or materials that exhibit a preference for or thrive in the presence of water. Its construction follows a transparent pattern in English where a noun is combined with a present participle to specify a characteristic affection or tendency.

Structure: water (liquid H₂O) + loving (having affection for) water: From Old English 'wæter', of Proto-Germanic origin; related to Dutch 'water' and German 'Wasser'. Functions as a noun root specifying the object of affinity. loving: From Old English 'lufian' (to love), of Proto-Germanic origin. The suffix '-ing' forms a present participle, here used adjectivally to mean "having the quality of loving."