D defs.my
Entry 2 senses Webster, 1913

Dropping

/drŏpʹĭng/ · Drop·ping · IPA /ˈdɹɑpɪŋ/
01 n. The action of causing to drop or of letting drop; falling.
  1. 1.
    The action of causing to drop or of letting drop; falling.
  2. 2.
    That which falls in drops; the excrement or dung of animals; -- often used in the plural.
Phrases & compounds
Dropping bottle — an instrument used to supply small quantities of a fluid to a test tube or other vessel.
Dropping fire — a continued irregular discharge of firearms.
Dropping tube — a tube for ejecting any liquid in drops.