millimeter
noun
mil·li·me·ter ˈmi-lə-ˌmē-tər 
variants US millimeter or British millimetre
: a unit of length equal to ¹/₁₀₀₀ meter see Metric System Table
Example Sentences
Recent Examples on the Web The palm-sized device is reportedly designed to sit on a bedside table and use millimeter-wave radar to sense your breathing, keeping an eye out for interruptions associated with the apnea sleeping disorder. 
Jon Porter, The Verge, 6 Jan. 2021 Patented by Van Cleef & Arpels in 1933, the Serti Mystérieux involves mounting each stone into extremely thin gold rails, each less than two-tenths of a millimeter, making the prongs invisible. Tiziana Cardini, Vogue, 19 July 2022 The probes were lined with four tiny round electrodes, each just over a millimeter in diameter, that were to deliver continuous electrical impulses to Fisher’s nucleus accumbens. Zachary Siegel, Harper’s Magazine , 17 Aug. 2022 The focus of the first visit is to make room for the laminates in your mouth, so the tooth structure is slightly reduced by less than one millimeter. Brooklyn White, Essence, 30 Apr. 2022 The shark came within a millimeter of severing a major artery, Nicholas Rottler, a trauma surgeon at the medical center, told KSBW-TV a day after the June 22 attack. CBS News, 14 July 2022 A year and a half ago, only getting low-band 5G might not have impeded the everyday Verizon experience much, considering how scarce its millimeter-wave 5G has been. Rob Pegoraro, PCMAG, 12 July 2022 The Xaver line uses millimeter wave (MMW) radar, or radar in the range of 30 - 300 gigahertz. Kyle Mizokami, Popular Mechanics, 7 July 2022 The Vanish Carbon’s sole measures 33 millimeters high from heel to forefoot, while the Nike Vaporfly Next% 2, for reference, has a heel that’s 40 millimeters thick and drops to a 32 millimeter forefoot height. Brian Metzler, Outside Online, 25 Apr. 2022 See More
Jon Porter, The Verge, 6 Jan. 2021 Patented by Van Cleef & Arpels in 1933, the Serti Mystérieux involves mounting each stone into extremely thin gold rails, each less than two-tenths of a millimeter, making the prongs invisible. Tiziana Cardini, Vogue, 19 July 2022 The probes were lined with four tiny round electrodes, each just over a millimeter in diameter, that were to deliver continuous electrical impulses to Fisher’s nucleus accumbens. Zachary Siegel, Harper’s Magazine , 17 Aug. 2022 The focus of the first visit is to make room for the laminates in your mouth, so the tooth structure is slightly reduced by less than one millimeter. Brooklyn White, Essence, 30 Apr. 2022 The shark came within a millimeter of severing a major artery, Nicholas Rottler, a trauma surgeon at the medical center, told KSBW-TV a day after the June 22 attack. CBS News, 14 July 2022 A year and a half ago, only getting low-band 5G might not have impeded the everyday Verizon experience much, considering how scarce its millimeter-wave 5G has been. Rob Pegoraro, PCMAG, 12 July 2022 The Xaver line uses millimeter wave (MMW) radar, or radar in the range of 30 - 300 gigahertz. Kyle Mizokami, Popular Mechanics, 7 July 2022 The Vanish Carbon’s sole measures 33 millimeters high from heel to forefoot, while the Nike Vaporfly Next% 2, for reference, has a heel that’s 40 millimeters thick and drops to a 32 millimeter forefoot height. Brian Metzler, Outside Online, 25 Apr. 2022 See More Word History
Etymology
French millimètre, from milli- + mètre meter
First Known Use
1797, in the meaning defined above
Kids Definition
millimeter
noun
mil·li·me·ter ˈmi-lə-ˌmē-tər
: a unit of length equal to 1/1000 meter
Medical Definition
millimeter
noun
mil·li·me·ter
variants or chiefly British millimetre
ˈmil-ə-ˌmēt-ər
: one thousandth of a meter —abbreviation mm