A sonorant vowel or consonant.
"In phonetics class, we learned that sounds like /m/ and /n/ are resonant because they allow air to flow without a complete blockage in the vocal tract."
characterized by resonance
"a resonant voice"
"hear the rolling thunder"
serving to bring to mind
"cannot forbear to close on this redolent literary note"
"a campaign redolent of machine politics"
Resounding, echoing.
"The drummer struck a resonant note that echoed through the empty hall."