phosphorus oxychloride

noun

: a volatile fuming liquid compound POCl₃ made usually by oxidation of phosphorus trichloride or by reaction of phosphorus pentachloride with phosphorus pentoxide and used chiefly in making phosphoric esters (as tricresyl phosphate)

called also phosphoryl chloride

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now