滴下

1. Origins, structure, and basic meaning

• Structure: 滴下 is read as てきか and is a technical noun used with する for liquid dripping or being added drop by drop.
• Basic usage: It can be transitive in 試薬を滴下する and intransitive in 水が滴下している.

2. Common pitfalls and similar expressions

• Actor and liquid
  • With を, a person adds the reagent dropwise; with が, the water itself is described as dripping.
• Manner of addition
  • It readily combines with 一滴ずつ and contrasts with pouring a liquid all at once using 注ぐ.