from The Century Dictionary.
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The word is taken from Hermes, the Greek name for Mercury, the heathen god of arts and learning, and the supposed inventor of chemistry,  which is sometimes called the hermetical art; or perhaps from Hermes, an ancient king of Egypt, who was either its inventor, or excelled in it.
A Catechism of Familiar Things; Their History, and the Events Which Led to Their Discovery. With a Short Explanation of Some of the Principal Natural Phenomena. For the Use of Schools and Families. Enlarged and Revised Edition.
He conceived a kind of hermetical or neoplatonic godhead creating in more and more eccentric circles, until the last, which rose in contradiction, was Lucifer to whom creation was committed.
MADRID—Debussy once wrote that music should be "a hermetical science," encoded so that people didn't treat it "as casually as they do a handkerchief."
It was the opinion of Plato, and is yet of the hermetical philosophers.
They absolutely changed from a hermetical, tribal people trying to be Western.
He left an extensive library, composed principally of chemical, hermetical, and philosophical works, of which the MSS. catalogue is now in the possession of my friend, the Rev.T. Corser.
The closing is made hermetical by means of an India rubber tube, K, which presses against the glass and the cover.
In order to study the first of these properties, the porous partition, fixed by a hermetical joint to a glass tube, is immersed in the water (Fig. 2).
The reasoning was: "Boiling has killed all forms of vitality _in_ the flask; by the hermetical sealing nothing living can gain subsequent access to the fluid; therefore, if living organisms do appear when the flask is opened, they must have arisen in the dead matter _de novo_ by spontaneous generation, but if they do never so arise, the probability is that they originate in spores or eggs."
Abbot John says of himself that he had passed from the solitary life, in which he was professed, to a less severe life, namely of those who lived in community, because the hermetical life had fallen into decline and laxity.