Etymology
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Words related to tube

boob tube (n.)
"television set," U.S. slang, by 1965, from boob "stupid person" + slang tube (n.) "television, television programming;" the original sets had vacuum tubes in them.
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test-tube (n.)
1809, from test (n.) + tube (n.). So called because it originally was used to test the properties of liquids. Test-tube baby is recorded from 1935.
tub (n.)
"open wooden vessel made of staves," late 14c., from Middle Low German, Middle Dutch, or Middle Flemish tubbe, of uncertain origin. Related to Old High German zubar "vessel with two handles, wine vessel," German Zuber. Considered to be unrelated to Latin tubus (see tube (n.)); one theory connects it to the root of two based on the number of handles. Also 17c. slang for "pulpit;" hence tub-thumper (1660s) "speaker or preacher who thumps the pulpit for emphasis."
tuba (n.)
1852 in reference to a modern, large, low-pitched brass musical instrument, from French tuba, from Latin tuba (plural tubae) "straight bronze war trumpet" (as opposed to the crooked bucina), related to tubus (see tube (n.)).
tubing (n.)
recreational pastime of riding a river on a truck tire inner tube, 1975; see tube (n.).
tubular (adj.)
1670s, "having the form of a tube or pipe," from Latin tubulus "a small pipe" (see tube) + -ar. Teen slang sense attested by 1982, Valspeak, apparently from surfers' use of tube as slang for a hollow, curling wave, ideal for riding (1962).