quaver
1. qua.ver \'kwa--v*r\ \'kwa-v-(*-)rin\ \'kwa-v-(*-)rin-le-\ \-(*-)re-\ vb
or qua.ver.ing [ME quaveren, freq. of quaven to tremble] 1: TREMBLE, SHAKE
{~ing inwardly} 2: TRILL 3: to utter sound in tremulous tones : to utter
quaveringly - qua.ver.ing.ly av
2. quaver n 1: EIGHTH NOTE 2: TRILL 3: a tremulous sound
Webster's English Dictionary