"pertaining to the bronchia," 1735, from Late Latin bronchus, from Greek bronkhos "windpipe, throat" (a word of unknown etymology) + -al (1). Bronchial tube is from 1847. Related: Bronchially.
Entries linking to bronchial
-al 1
suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).