Obs. [a. med.L. soda, ad. Arab. ṣodās, f. ṣadas to split.] Headache.

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c. 1540.  Boorde, Boke for to Lerne, C iij b. The fallyng sycknes called … Appoplesia, Soda.

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1590.  Barrough, Meth. Physick, I. i. (1639), 1. That there are onely three sundry paines in the head: wherof the one is called of the Greeks κεφαλαλγὶα…; the barbarous sort of Physitians call it Soda.

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1661.  Lovell, Hist. Anim. & Min., 97. It helpeth the soda (that is an old head ach)…. With saffron and a little camphire it helps the cold soda.

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1693.  trans. Blancard’s Phys. Dict. (ed. 2), Soda, the same with Cephalalgia.

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