the.com/bass clarinet

means A larger, lower-pitched member of the clarinet family that plays roughly an octave below the standard B♭ clarinet, with a curved metal neck and upturned bell.

from "Clarinet" descends from the Old Italian clarino/clarinetto, diminutive of clarino (a type of trumpet), ultimately from Latin clarus, "clear" — so the name means roughly "little clear/bright one," a nod to its bright upper register. "Bass" comes from Latin bassus, "low, short," which also gave us "base." The bass clarinet itself was developed through various experimental designs; the modern form with its folded body, metal neck, and flared bell was largely standardized in the 1800s, notably through the work of instrument makers refining Adolphe Sax's and others' earlier attempts to get the unwieldy low clarinet to actually play in tune.