thumbnail noun Stress: first syllable 🤍 Save Syllables: thumb-nail (2) English Definition The nail of a thumb, or a very small computer image or representation. Example Sentence The thumbnail of the video was very attractive. US IPA /ˈθʌmneɪl/ 🔊 Listen US UK IPA /ˈθʌmneɪl/ 🔊 Listen UK Synonyms miniature preview sketch Share this Word Facebook WhatsApp X Telegram Copy Link