The spelling of the word "ARMSPCR" can seem confusing at first glance. However, breaking it down with the International Phonetic Alphabet (IPA) helps explain its spelling. "ARMS" is pronounced /ɑːmz/, with a strong "ah" sound and a "z" at the end. "PCR" is pronounced /piː.siː.ɑːr/, with a long "ee" sound in the first two letters, an "s" in the middle, and a strong "ar" sound at the end. Together, "ARMSPCR" refers to a method of genetic testing using polymerase chain reaction.