a balloon for the visual observation of upper-atmosphere wind currents.
a meteorological balloon used to observe air currents


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    [hahrd-tak] /ˈhɑrdˌtæk/ noun 1. a , saltless biscuit, formerly much used aboard ships and for army rations. noun 1. . /ˈhɑːdˌtæk/ noun 1. a kind of hard saltless biscuit, formerly eaten esp by sailors as a staple aboard ship Also called pilot biscuit, ship’s biscuit, sea biscuit noun 1. another term for hardtack n. 1836, […]

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