What's the difference between hypostases and hypostasis?

Hypostases

Definition:

Example Sentences:

(1) Hypostase a glandular tissue, can secrete its cell contents into the embryonic sac during the development of free endosperm nuclei.
(2) In 15 of these families the hypostase is present together with the Polygonum type of embryonic sac and nuclear type of endosperm.
(3) Of 78 randomly selected families, 19 display different numbers of species with hypostase.
(4) The presence of pyriform hypostase tissue was investigated before double fertilization till the fusion of free endosperm nuclei in the embryonic sac of A. graveolens.

Definition:

(n.) That which forms the basis of anything; underlying principle; a concept or mental entity conceived or treated as an existing being or thing.
(n.) Substance; subsistence; essence; person; personality; -- used by the early theologians to denote any one of the three subdivisions of the Godhead, the Father, Son, and Holy Spirit.
(n.) Principle; an element; -- used by the alchemists in speaking of salt, sulphur, and mercury, which they considered as the three principles of all material bodies.
(n.) That which is deposited at the bottom of a fluid; sediment.

Example Sentences:

(1) Early functional treatment and hypostasis therapy will promote the prophylaxis of pneumonia.
(2) It seems probable that colouration of the teeth would be found in those regions of the jaws where the blood is seeking on the basis of gravitation hypostasis.
(3) Hypostasis in the head and neck occurred more rapidly and intensively the deeper the cranial parts of the body were placed.
(4) The primary red colouration is most likely due to haemoglobin derivatives within the necrotic pulp tissue in cases in which blood has accumulated in the head and the dependent lividity (hypostasis) is obstructed.
(5) Five other cases were distinguished by linear marks indicating the water level, and in 10 cases a peculiar restriction of the postmortem hypostasis on the submersed areas could be seen.
(6) Epistasis-hypostasis interactions take place between genes of SU and SR complexes.
(7) Parenchymal edema, vasodilation and hypostasis reappear at the height of a lesion, followed by rarefaction of the network and vasoconstriction of the microcirculatory bed.