shaped like an ear, as the shell of certain mollusks
Word origin
[1810–20; auri-2 + -form]This word is first recorded in the period 1810–20. Other words that entered Englishat around the same time include: duplex, keyboard, rationalize, technique, triangulation-form is a combining form meaning “having the form of”. Other words that use the affix-form include: arcform, iodoform, moniliform, somatoform, tectiform