What does "fatless" mean?

Without fat, especially in the senses: made without fat, fat-free.

What is a synonym for "fatless"?

Common synonyms include: fat-free, lean meat, nonfat.

/ˈfætləs/ adj

adj ·Rare ·Advanced level

Adjective

1
Without fat, especially in the senses: made without fat, fat-free. not-comparable
"Soon oranges were seedless, The putting green was weedless, The college boy hatless, The proper diet, fatless, […]"

Adjective

"Soon oranges were seedless, The putting green was weedless, The college boy hatless, The proper diet, fatless, […]"

From fat + -less.