thermobaricEtymologyFrom thermo- + baric, derived from the Ancient Greek words for “heat” and “pressure”: θερμοβαρικός (thermobarikós), from θερμός (thermós, “hot”) + βάρος (báros, “weight, pressure”) + -ικός (-ikós, “-ic”).adjDescribing various weapons that use atmospheric oxygen to produce a blast wave of a significantly longer duration than those produced by condensed explosives.“Fears have risen over the use of thermobaric weapons by Russia after the Ukrainian ambassador to the US said a vacuum bomb – another term for the weapon – had been used during the invasion.”nounA thermobaric weapon.