No, the word 'toxic' is an adjective, a word that describes a noun. Adjectives do not have singular and plural forms; adjectives have comparative forms:
The plural of "she" is "they", so the plural of "she had" is "they had".
The plural of rose is roses. The plural possessive is roses'.
The plural of 'bunch' is bunches.The plural of 'ant' is ants.The plural of 'batch' is batches.The plural of 'day' is days.The plural of 'chimney' is chimneys.The plural of 'tomato' is tomatoes.The plural of 'umbrella' is umbrellas.The plural of 'donkey' is donkeys.The plural of 'sky' is skies.The plural of 'foot' is feet.The plural of 'show' is shows.
Knights is a plural. It is the plural for knight.
applied is does not have a plural but is apply it does have a plural.
That is the correct spelling of the word "toxic" (poisonous).
Toxic is an adjective.
They will always remain toxic. A toxic chemical is a toxic chemical. Cyanide will always have the ability to kill you and will never, not be deadly.
The plural of "she" is "they", so the plural of "she had" is "they had".
The plural of 'this' is 'these' and the plural of 'that' is 'those'.
Isthmi is plural. There are actually two plural forms. I will list them from singular to plural. Isthmus - Singular Isthmi - Plural Isthmuses - Plural
flammable or toxic
toxic
Very toxic.
The plural of rose is roses. The plural possessive is roses'.
The plural form of can is cans.
Knights is a plural. It is the plural for knight.