'glare-producing' is a modern English compound formed from the noun 'glare' and the present-participle adjective-forming element 'producing' (from the verb 'produce'). 'Produce' originates from Latin 'producere' where 'pro-' meant 'forward' and 'ducere' meant 'to lead'.

'glare' is recorded in Middle English (e.g. 'glaren') with senses relating to a harsh or staring light (and to staring); its exact earlier origin may include Scandinavian influence. 'Produce' came into English via Old French and Middle English from Latin 'producere'; the present participle form produced compounds like '...-producing' in modern English.

Individually, 'glare' has long carried the sense of harsh or dazzling light (and related senses of staring), and 'produce' originally meant 'lead forth' in Latin but evolved to mean 'bring into being' or 'cause'. Combined as 'glare-producing', the compound straightforwardly means 'causing glare'.