D defs.my
Entry 2 senses Webster, 1913

Trilling

/trĭl'-ĭng/ · Tril·ling · IPA /trˈɪlɪŋ/
01 n. One of tree children born at the same birth.
  1. 1.
    One of tree children born at the same birth.
  2. 2.
    A compound crystal, consisting of three individuals.(Crystallog.)