Dr. Shapiro's Question of the Day IV by ShapiroA

Question 4

From a certain entry on Wikipedia: "In the terminology of phonetics, the sound has been described as a voiceless linguolabial trill, [r̼̊] ... A ___ is never used in human language phonemically (that is, as a building block of words), but it is widely used across human cultures."

What word (which is also a kind of fruit) has been redacted?