A modifier is a word or group of words that modifies another word or group. In some descriptions of grammar, only words that are used before a noun are called modifiers .
英英词典释义
Noun
1. a content word that qualifies the meaning of a noun or verb
2. a moderator who makes less extreme or uncompromising
3. a person who changes something;
"an inveterate changer of the menu"
4. a gene that modifies the effect produced by another gene