The word 'urinal' has a direct and functional lineage from Latin. Its core, 'urin-', originates from the Latin urina, which itself has Proto-Indo-European roots likely related to words for water or liquid flow. The suffix '-al', from Latin -alis, is a common adjectival ending meaning "pertaining to". Thus, the literal construction means "pertaining to urine". In Medieval Latin, urinal was used for a vessel for examining urine for medical purposes. This meaning evolved in English to specifically denote the receptacle or facility designed for the act of urination, shifting from a diagnostic container to a standard sanitary fixture.

Structure: urin (urine) + al (pertaining to) - urin: From Latin urina, meaning "urine". It functions as the core semantic root. - al: A suffix from Latin -alis, meaning "of, relating to, or characterized by". It forms adjectives (and nouns from adjectives) indicating a connection.