mater

The root mater starts with one of the oldest words in the language: Latin mater, "mother" — the same word as Greek mētēr, Sanskrit mātṛ, and English mother itself. All of them trace back to a single prehistoric form that probably began as a baby's syllable, "ma."

From "mother" Latin made a brilliant leap. The Romans noticed that a tree trunk is the part of a tree that produces the new growth — the branches and shoots all spring from it. So they called that trunk-wood materia, literally "the mother-stuff," the source from which growth comes. Materia first meant "timber, building wood," then broadened to "the stuff anything is made of." That is exactly the metaphor hiding inside our word material: the mother-substance, the raw stuff you build with.

From materia English inherited a whole family about substance:
- material — the stuff something is made of; and as an adjective, "made of matter" → "physical" → "substantial, significant" (a material difference)
- matter — the worn-down everyday form of materia: first "physical substance," then by metaphor "a thing to be dealt with" (a business matter) and the verb "to be of substance, to be important" (it doesn't matter)
- materialize — to take on material form, to become real
- materialism — the philosophy that only matter exists (唯物主义), and the everyday sense of valuing possessions (物质主义)

Meanwhile the "mother" sense of mater stayed alive on its own branch:
- maternal — motherly, on the mother's side (cf. paternal)
- matrix — from mātrīx, "a breeding female, womb," the place where something is generated; that "womb → generating ground" image became the modern "grid that everything sits in": a matrix of numbers, the matrix of a culture
- and the wider cousins matron (a married mother-figure), matriculate (originally to enter a register — a matricula, a "little womb-list" of members), and alma mater ("nourishing mother," the school that raised you)

So the whole family hangs on one image: the mother as the source. From her you get either the literal mother (maternal, matrix, matron) or, by the trunk-wood metaphor, the stuff things are made of (material, matter, materialize). Matter and material are not just similar — they are the same Latin word, materia, arriving twice: once worn smooth through French (matter) and once kept formal (material).