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firmament

[fur-muh-muh nt] /ˈfɜr mə mənt/
noun
1.
the vault of heaven; sky.
Origin of firmament
1250-1300
1250-1300; Middle English < Late Latin firmāmentum sky, Latin: support, prop, stay, equivalent to firmā(re) to strengthen, support (see firm2) + -mentum -ment
Related forms
firmamental
[fur-muh-men-tl] /ˌfɜr məˈmɛn tl/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for firmament

firmament

/ˈfɜːməmənt/
noun
1.
the expanse of the sky; heavens
Derived Forms
firmamental (ˌfɜːməˈmɛntəl) adjective
Word Origin
C13: from Late Latin firmāmentum sky (considered as fixed above the earth), from Latin: prop, support, from firmāre to make firm1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for firmament
n.

mid-13c., from Latin firmamentum "firmament," literally "a support or strengthening," from firmus "firm" (see firm (adj.)), used in Vulgate to translate Greek stereoma "firm or solid structure," which translated Hebrew raqia, a word used of both the vault of the sky and the floor of the earth in the Old Testament, probably literally "expanse," from raqa "to spread out," but in Syriac meaning "to make firm or solid," hence the erroneous translation.

Online Etymology Dictionary, © 2010 Douglas Harper
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