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The story

Firmāre is the present active infinitive of firmō (‘to make firm, strengthen’), from firmus (‘firm, strong, stable’), ultimately from Proto-Indo-European *dʰer- (‘to hold; to support’). The Latin word was used in the Vulgate version of the Bible to translate the Ancient Greek στερέωμα (steréōma, “foundation, framework; firmament”) in the Septuagint (Greek Old Testament), which in turn was used to translate the Hebrew רָקִיעַ (rāqī́aʿ, “celestial dome, vault of heaven”), from the root ר־ק־ע (r-q-`); in Classical Syriac the similar root ܪ ܩ ܥ (related to compacting) gave rise to ܪܩܝܥܐ (rəqīʿā, “compact; firm; firmament, heavens, sky; celestial sphere”).