resonant

Short definition from Wiktionary

Adjective

1. 1
   Resounding, echoing.
2. 2
   Adjusted as to dimensions so that currents or electric surgings are produced by the passage of electric waves of a given frequency.

Noun

1. 1
   A sonorant vowel or consonant.
2. 2
   A sonorant vowel or consonant: Any of the Proto-Indo-European consonants *l, *m, *n, *r, w (u̯), and y (i̯) or its descendants in an Indo-European language, capable of syllabic pronunciation in the zero grade and represented by the cover symbol ⟨R⟩ in structural notation.