mean solar second
noun
mean so·lar sec·ond
-ˌsō-lər-ˈsek-ənd, -ənt 
: an mks unit of time equal to 1/86,400 of a mean solar day
Cite this Entry
“Mean solar second.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/mean%20solar%20second. Accessed 31 Oct. 2025.
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