The Spanish word 'lingual' comes from the Latin word 'lingualis', meaning 'relating to the tongue'. This Latin word was formed by combining two parts: the noun 'lingua' meaning 'tongue', and the suffix '-alis' meaning 'relating to'. This combination created an adjective that specifically describes things that are connected to or having to do with the tongue.

Some related Spanish words include 'lengua' (tongue/language), 'lingüística' (linguistics), and 'bilingüe' (bilingual). All these words share the same Latin root 'lingua'. While 'lengua' directly refers to the physical tongue or language itself, 'lingual' specifically describes characteristics relating to the tongue or language.

English speakers might recognize the connection to words like 'linguistic', 'linguistics', and 'linguist', all of which relate to the study of language. The word 'language' itself, though it might not look similar at first glance, also comes from the same Latin root 'lingua'. The English word 'lingual' exists as well, with the same meaning as its Spanish counterpart, making it a cognate (words in different languages that share the same origin and meaning).