lub-dub

interjection

Used to represent the normal rhythm of the heart on auscultation, comprising the first and second heart sounds.

Meanings

interjection

alternative lub-dup

  1. onomatopoeicmedicineUsed to represent the normal rhythm of the heart on auscultation, comprising the first and second heart sounds.
    1 more example

    Ralph tried to listen above the steady lub-dub, lub-dub of Ryan's heart, but soon he grew bored. Ryan's shirt was new and the flannel still fuzzy. Ralph nipped a hole in the front of the pocket for a better view and then, lulled by the muffled lub-dub, lub-dub and the steady rise and fall of Ryan's chest, fell asleep as if he were being rocked in a cradle.

    1982, Beverly Cleary, Ralph S. Mouse, New York, NY: HarperCollins, published 2000, →ISBN, page 51
verblub-dub (third-person singular simple present lub-dubs, present participle lub-dubbing, simple past and past participle lub-dubbed)

present singular third person lub-dubs · participle present lub-dubbing · participle past lub-dubbed · past lub-dubbed · alternative lub-dup

  1. intransitiveOf a heart, to beat.

    I pulled my eyes away to glance downstream at a cinder cone perched at the brink of the left Esplanade above the mouth of Prospect Canyon and the still-hidden Lava Falls. My heart lub-dubbed a few beats quicker.

    1992, Michael P. Ghiglieri, Canyon, Tucson, AZ: University of Arizona Press, →ISBN, page 237

Origin

The low-pitched, longer first heart sound forms lub. The higher-pitched, shorter second heart sound forms dub.

Full word history & related roots →
Cite this entry
APA

lub-dub. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/lub-dub

MLA

“lub-dub.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/lub-dub. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “lub-dub,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/lub-dub.

Source: lub-dub on Wiktionary, CC BY-SA 4.0.