ulna

noun

ul·​na ˈəl-nə 

plural ulnae ˈəl-nē  or ulnas

: the bone on the little-finger side of the human forearm

also : a corresponding part of the forelimb of vertebrates above fishes

ulnar

ˈəl-nər 

-ˌnär

adjective

Examples of ulna in a Sentence

Recent Examples on the Web

The radius and ulna in the forearm run parallel, connecting your elbow to your wrist. —Maggie Aime, Msn, Health, 6 Dec. 2024

Her injuries were consistent with those found in modern humans who reach their hands out toward the ground to break a fall: greenstick fractures across both forelimb bones, the radius and the ulna. —Carly Miller, Forbes, 11 Oct. 2024

Accomplishing even this step proved especially difficult because of the need to precisely align the volunteer’s radius and ulna. —Andrew Paul, Popular Science, 12 Oct. 2023

This air breathing fish’s front fins even have an ulna and a radius like our forearms do, and they’re coded by the same set of genes, reports Tessa Koumoundouros for Science Alert. —Alex Fox, Smithsonian Magazine, 27 Jan. 2021

Word History

Etymology

New Latin, from Latin, elbow — more at ell

First Known Use

1541, in the meaning defined above

Phrases Containing ulna

• radio-ulna

Kids Definition

ulna

noun

ul·​na ˈəl-nə 

plural ulnae -nē  or ulnas

: the bone on the little-finger side of the human forearm

also : a corresponding part of the forelimb of vertebrates

ulnar

-nər 

adjective

Medical Definition

ulna

noun

ul·​na ˈəl-nə 

plural ulnae -nē  or ulnas

: the bone on the little-finger side of the human forearm that forms with the humerus the elbow joint and serves as a pivot in rotation of the hand