Some cosmologists propose that a dark fluid permeates the universe, behaving like dark matter on galactic scales while driving accelerated expansion on cosmic scales.

The research team used a nano-fluid as a coolant in the prototype engine, which significantly improved cooling performance.

We need to refill the fog fluid before tonight's show so the fogger can run all evening.

After the long hike, we cracked open an amber fluid and relaxed by the campfire.

The pharmacist added a fluid drachm of tincture to the mixture, carefully measuring to ensure accuracy.

She always kept a small bottle of lighter fluid in her camping kit.

She kept a bottle of correction fluid in her desk drawer for fixing handwritten errors.

She collected a sample of her menstrual fluid to show the doctor the unusual color.

The machinist changed the cutting fluid after noticing increased tool wear and overheating.

The lab technician carefully collected a sample of brain fluid for analysis.