ton n.1

mid-14c., "musical sound or note," from Old French ton "musical sound, speech, words" (13c.) and directly from Latin tonus "a sound, tone, accent," literally "stretching" (in Medieval Latin, a term peculiar to music), from Greek tonos "vocal pitch, raising of voice, accent, key in music," originally "a stretching, tightening, taut string," which is related to teinein "to stretch" (from PIE root *ten- "to stretch").

The sense of "manner of speaking" is from c. 1600. In reference to firmness of body, from 1660s. As "prevailing state of manners" from 1735; as "style in speaking or writing which reveals attitude" from 1765. Tone-deaf is by 1880; tone-poem by 1845.

"large cask," especially one for wine, ale, or beer, Old English tunne "tun, cask, barrel," a general North Sea Germanic word (compare Old Frisian tunne, Middle Dutch tonne, Old High German tunna, German tonne), also found in Medieval Latin tunna (9c.) and Old French tonne (diminutive tonneau); perhaps from a Celtic source (compare Middle Irish, Gaelic tunna, Old Irish toun "hide, skin"). Tun-dish (late 14c.) was a funnel made to fit into the bung of a tun.

— That? said Stephen. — Is that called a funnel? Is it not a tundish? —

— What is a tundish? —

— That. The ... the funnel. —

— Is that called a tundish in Ireland? — asked the dean. — I never heard the word in my life. —

— It is called a tundish in Lower Drumcondra — said Stephen, laughing — where they speak the best English.—

— A tundish — said the dean reflectively. — That is a most interesting word I must look that word up. Upon my word I must. —

His courtesy of manner rang a little false, and Stephen looked at the English convert with the same eyes as the elder brother in the parable may have turned on the prodigal. [Joyce, "Portrait of the Artist as a Young Man"]