👉 The fingernail on the thumb.
Alright class, settle down and let’s take a look! You’ve asked a very good question today, it’s true, About a little nail, shiny and new. The dictionary tells us, clear as can be, “A thumbnail is the fingernail on your knee… well, actually, your thumb, you see!” It’s that small little nail, right at the tip, That helps you pick things up with a gentle grip. Think about drawing pictures, or peeling a fruit, Your thumbnail’s handy - it's quite astute! Does that make sense to you, my dear students bright? Do you have any questions, shining like light?