cardinal vowels
A set of reference vowels used by phoneticians to describe language sounds. For example, the vowel of the English word "feet" can be described with reference to cardinal vowel 1 [i], which is the cardinal vowel closest to it.

The cardinal vowels with Daniel Jones

1. The current system was systematised by Daniel Jones in the early 20th century, though the idea goes back to earlier phoneticians, notably Ellis and Bell.

Please comment