Pappus n. : The hairy or feathery appendage of the achenes of thistles, dandelions, and most other plants of the order Compositae; also, the scales, awns, or bristles which represent the calyx in other plants of the same order.

Example:
What is the simplest math theorem created by Pappus of Alexandria to understand?

Taxonomy
Pappus, Pappus of Alexandria, ratio, theorems, Euclid, treatises, preface, straight lines, circle, curve, lemmas, free encyclopedia, states, Greek mathematician, Apollonius, polyhedra, Dating, great circle.

Defination from the web:
Pappus of Alexandria (Greek Πάππος ὁ Ἀλεξανδρεύς) (c. 290 – c. 350) was one of the last great Greek mathematicians of antiquity, known for his ... In his extant writings, Pappus gives no indication of the date of the authors whose treatises he makes use of, or of the time (but see ...