The longest word in the Spanish language has been debated over for a long time, as is the case with the longest word in English.
The adverb superextraordinarísimamente (superextraordinarily) (Spanish pronunciation: [supeɾekstɾaorðinaˈɾisimaˈmente]), at 27 letters, is often considered to be the longest in the Spanish language. However, the status of this word has been challenged for improper construction (it contains two superlatives, something not accepted by Spanish language rules).
The noun esternocleidomastoideitis (sternocleidomastoiditis), at 25 letters, is the longest valid word in Spanish. It is, however, a medical term rarely used outside this specific context.
The 24-letter word electroencefalogalarafisitasto (electroencephalographists) is often cited as the longest Spanish word in actual use.
The 23-letter words esternocleidomastoideos (sternocleidomastoids) and anticonstitucionalmente (anticonstitutionally) are two of the longest words in the Spanish language. The latter one is generally credited as the longest word in general usage.
