dehydration synthesis
It's a type of condensation reaction in which a water molecule is produced by the reaction between 2 organic molecules. Maybe it's sorta like water falling from the sky, rain. Rain is a condensation of liquid water from water vapor. Of course the precipitation of water in a rain storm is physical phase change not a chemical reaction, but zillions of rain drop falling from the sky may help with visualizing this type of chemical reaction.
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.