Is toast singular, plural, or both?

Is the word plethora used correctly in these sentences.

There is a plethora of dog hair in our carpet.

There are a plethora of people at the mall.

Thank you for using the Jiskha Homework Help Forum. A good Online Dictionary will always help you as well.

toast = singular
If you must have plural, many people say "pieces of toast."
plethora = singular

Therefore the last sentence should be "There is a plethora of people at the mall."

Both. You could say "I want a piece of toast" or "I'm going to make 7 pieces of toast". You couldn't say "I want some toasts".

Toasts is also plural when it is used in this situation. The best man and the bride's father were asked to make TOASTS at the reception.