low-mass

The term "low-mass" is a modern English compound, transparently constructed from two foundational words. "Low," of Germanic origin, evolved from a concrete sense of a "mound" or physically "low" position to describe anything of a small degree or amount. "Mass," entering English via Latin and ultimately from a Greek word for a lump of dough, came to signify the fundamental physical property of an object's quantity of matter. Combined in the 20th century, primarily in astrophysics and physics, the compound "low-mass" logically and literally describes an entity possessing a small quantity of matter, distinguishing such objects (like red dwarf stars or certain exoplanets) from their more massive counterparts.

Structure: low (small in amount/degree) + mass (quantity of matter) low: From Old English hlāw, hlǣw ("mound, hill"), later influenced by Old Norse lágr ("low"). In this compound, it functions as an adjective meaning "small in amount, degree, or intensity." mass: From Latin massa ("kneaded dough, lump, mass"), via Greek mâza ("barley cake"). In this compound, it functions as a noun denoting the property of "a quantity of matter."