fibula

noun

fib·​u·​la ˈfi-byə-lə 

plural fibulae ˈfi-byə-lē  -lī  or fibulas

1

: the outer and usually smaller of the two bones between the knee and ankle in the hind or lower limbs of vertebrates

2

: a clasp resembling a safety pin used especially by the ancient Greeks and Romans

fibular

ˈfi-byə-lər 

adjective

Illustration of fibula

• fibula 2

Examples of fibula in a Sentence

Recent Examples on the Web

His rookie season ended in Week 8 with a fractured fibula, ruptured deltoid ligament and dislocated ankle. — Jacob Robinson, New York Times, 21 July 2026

Jeffrey Schmidt, the attorney representing the couple, tells PennLive Elizabeth broke her tibia and fibula. — Colson Thayer, PEOPLE, 10 July 2026

Pulisic has a bone bruise and a microfracture of his tibia and fibula, the person said. — Ronald Blum, Chicago Tribune, 9 July 2026

ElAttrache performed surgery on McGregor in July 2021, inserting a rod, plates and screws into his left leg after the fighter broke his tibia and fibula during a mixed martial arts bout against Dustin Poirier in Las Vegas. — Los Angeles Times Staff, Los Angeles Times, 24 June 2026

Word History

Etymology

Latin, pin, clasp; akin to Latin figere to fasten

First Known Use

1578, in the meaning defined at sense 1

Kids Definition

fibula

noun

fib·​u·​la ˈfib-yə-lə 

plural fibulae -ˌlē 

-ˌlī

or fibulas

: the outer and usually the smaller of the two bones between the knee and ankle of the hind or lower limb

fibular

-lər 

adjective

Medical Definition

fibula

noun

fib·​u·​la ˈfib-yə-lə 

plural fibulae

-lē also -ˌlī

or fibulas

: the outer or postaxial and usually the smaller of the two bones of the hind or lower limb below the knee that is the slenderest bone of the human body in proportion to its length, articulates above with the external tuberosity of the tibia and below with the talus, and has its lower end forming the external malleolus of the ankle

called also calf bone

fibular

-lər 

adjective