VES'ICLE, noun [. vesicula. See Vesicate.] 1. A little bladder, or a portion of the cuticle separated from the skin and filled with some humor. 2. Any small membranous cavity in animals or vegetables. The lungs consist of vesicles admitting air.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI