1thumb·nail 
/ˈθʌmˌneɪl/ noun
plural thumb·nails /ˈθʌmˌneɪl/ noun [count] 1 : the hard covering at the end of a thumb : the fingernail of a thumb — see picture at hand 2 computers : a very small copy of a larger picture on a computer
▪ You can see a larger version of the picture by clicking on the thumbnail.
▪ You can see a larger version of the picture by clicking on the thumbnail.
