2. The action of the organs in producing such sounds; as, to give a trill to the tongue. d

3. (Mus.)

Defn: A shake or quaver of the voice in singing, or of the sound of an instrument, produced by the rapid alternation of two contiguous tones of the scale; as, to give a trill on the high C. See Shake.

TRILLACHAN
Tril"la*chan, n. (Zoöl.)

Defn: The oyster catcher. [Prov. Eng.]

TRILLING
Tril"ling, n. Etym: [Cf. G. drilling.]

1. One of tree children born at the same birth. Wright.

2. (Crystallog.)

Defn: A compound crystal, consisting of three individuals.

TRILLION Tril"lion, n. Etym: [F. trillion, formed from the pref. tri- in imitation of million a million. Cf. Billion.]