Noun, Noun which may take the genitive case particle 'no'
having missing teeth; toothlessness
ボードが箱に歯抜けで入れられてるから、詰めていれれば、箱がもっと有効につかえるよ。There are gaps between the boards in the box. If you fit them in snugly, you'll get more use out of the box.
Also written 歯脱け【はぬけ】