IPA: //ˌpɛntəˈbɑːrbɪtoʊn//
KK: /pɛntəˈbɑrbɪtoʊn/
A type of medication that is a barbiturate, used primarily as a sedative or anesthetic.
The veterinarian administered pentobarbitone to sedate the animal before surgery.
Pentobarbitone is formed from "penta-" (meaning five) and "barbitone" (derived from "barbituric acid", which comes from "barbituric" — a compound name that includes "uric" referring to urea). The term refers to a barbiturate with five carbon atoms in its structure, used as a sedative and anesthetic.
Think of 'five' ('penta-') combined with a compound related to 'urea' ('barbituric') to remember that pentobarbitone is a sedative with a specific chemical structure.
No commonly confused words.