词根词缀：ped-, pedi-, -pedal, -ped, -pede, -pedia
【来源及含义】Latin: foot, feet; people often see this ped element in other words. When people refer to "pedal extremities", they mean "feet". When anyone pushes the pedals of a bicycle, it is done with the feet. A pedestrian must use the feet for walking. A quadruped has four feet while a centipede has "100 feet"; or a large number of them because it may be impossible to count all of them.
【相关词根词缀】 Related "foot, feet" units: melo-; planta-; podo-; -pus.
【同源单词】aliped, anguiped, anomaliped, biped, bipedal, bipedal
词根词缀：tri-, tre-
【来源及含义】Greek > Latin: a numerical prefix meaning, three, thrice, threefold; triple; a word element for number 3
【相关词根词缀】 Cross references of word families that are related, partially or totally, to: "three, third": terce-; terti-; trigono-; trito-.