vesicular structure

small enclosed cavity found in some volcanic rock, such as basalt

en-GB/vɛˈsɪkjʊlə ˈstɹʌkt͡ʃə/
en-US/vɪˈsɪkjʊlɚ ˈstɹʌkt͡ʃɚ/

ক্যাটাগরি:

structure