In reply to the query of Gritchka about ave atque vale, manantia seems to derive from the Latin mano, manare, to flow or exude.

Here are some instances I found:

ad dentium dolores decountur in aceto, ad aurium vitia, rheumatismos cicatricum, ulcerum manantia.

Pliny Historia Naturalis, xxiii

capillum fluentem cohibet nigirtiamque custodit, auribus cum hydromelite aut rosaceo infunditur, furfures cutis et manantia ulcera sale addito sanat, tussim veterem cum styrace sumptum, efficacissimum ad ructus..

Pliny Historia Naturalis, xxvi

... si manantia corpuscula per inuisibilia foramina subsistendo iter claudunt, ut Asclepiades contendit ...

A. Cornelii Celsi De medicina libri VIII, Liber primus

... ad caelum tollens manantia fletu Lumina, sollicito dedit has de pectore voce ...

Raymundus Cunichius Ragusinus Homeri Ilias Latinis versibus expressa, Liber Primus

Quis numerare queat quot ab hoc manantia Monte flumina sint, sacro passim nascentia fonte ?

MOYSES PERGAMENSIS, Liber Pergaminus.

Someone who speaks Spanish may be able to confim that El Manantial means 'ocean current or stream' or possibly the Gulf Stream in particular.

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