Meaning

noun a round shape formed by a series of concentric circles (as formed by leaves or flower petals)

originFrom Late Middle English giren (“to turn (something) away; to cause (something) to revolve or rotate; to travel in a circle”), from Old French girer (“to turn”), and directly from its etymon Latin gȳrāre, the present active infinitive of gȳrō (“to turn in a circle, rotate; to circle or revolve around”), from gȳrus (“circle; circular motion”) (see etymology 1) + -ō (suffix forming regular…

Etymology from Wiktionary, CC BY-SA 3.0