"pertaining to the pharynx," especially of speech sounds, 1799, with -al (1) + Modern Latin pharyngeus, from pharynx (see pharynx). Alternative pharyngal is attested by 1835, from Modern Latin pharyngem + -al (1).
"musculo-membranous pouch at the back of the nasal cavities, mouth, and larynx," 1690s, from Greek pharynx (genitive pharyngos) " throat, joint opening of the windpipe," which is related to pharanx "cleft, chasm, gully, deep trench;" all of uncertain origin; Beekes suggests Pre-Greek origin. The combining form is pharyngo-, before vowels pharyng-; the Modern Latin plural is pharynges.
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Harper, D. (n.d.). Etymology of pharyngeal. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/pharyngeal