1) Change 2) To become vesicular 3) To make vesicular 
• (a.) Bladdery; full of, or covered with, bladders; vesicular. • (v. t.) To form vesicles in, as lava.
1. To become vesicular. ... Synonym: vesicular. ... (05 Mar 2000) ... 
Ve·sic'u·late adjective Bladdery; full of, or covered with, bladders; vesicular. 
Type: Term Pronunciation: vĕ-sik′yū-lāt Definitions: 1. To become vesicular. Synonyms: vesicular2
[v] - become vesicular or full of air cells 2. [v] - cause to become vesicular or full of air cells