The story
From Ancient Greek πᾰρᾰτείνω (părăteínō, “to stretch out along, beside or near; to continue life, live”) + -ic, from πᾰρᾰ- (pără-, “beside, by”) + τείνω (teínō, “to stretch, pull tight”).
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Not needed for the development of the parasite, but nevertheless serving to maintain the parasite's life cycle. Full definition →
From Ancient Greek πᾰρᾰτείνω (părăteínō, “to stretch out along, beside or near; to continue life, live”) + -ic, from πᾰρᾰ- (pără-, “beside, by”) + τείνω (teínō, “to stretch, pull tight”).
Etymology from Wiktionary, CC BY-SA 4.0.