The word "pearltumor" is spelled as /ˈpɜrl tuːmər/. The first syllable "pearl" is pronounced with an open-mid central vowel /ɜ/ and the second syllable "tumor" is pronounced with a diphthong /tuː/. The spelling of the word "pearltumor" reflects the two components of the word - "pearl" suggesting a round and smooth shape, and "tumor" indicating an abnormal growth of tissues. The word is used to describe a type of tumor characterized by round and smooth surfaces, similar to pearls.