• (n.) Any one of numerous small two-winged flies of the family Ortalidae. The larvae of many of these flies live in fruit; those of others produce galls on various plants.
Or`ta·lid'i·an noun (Zoology) Any one of numerous small two-winged flies of the family Ortalidæ . The larvæ of many of these flies live in fruit; those of others produce galls on various plants.