A drop of liquid (e.g., water); a drip (often written 雫 as well). Refers to a single droplet such as a raindrop or a tear.
朝露の滴が草に光っている。
Drops of morning dew are glistening on the grass.
雨が屋根からポタポタと滴り落ちる音が聞こえる。
You can hear the drip-drip sound of rain falling from the roof.
彼女の頬に一粒の雫が伝った。
A single drop rolled down her cheek.