▪ I. hydrogenous, a. Chem.
(haɪˈdrɒdʒənəs)
[f. hydrogen + -ous.]
Of, pertaining to, or consisting of hydrogen.
† hydrogenous gas, an early name for hydrogen; † carbonated hydrogenous gas = carburetted hydrogen; † hydrogenous sulphurated gas = sulphuretted hydrogen.
| 1791 Hamilton Berthollet's Dyeing I. i. i. v. 81 Dr. Priestley obtained inflammable air, or hydrogenous gas. 1800 Henry Epit. Chem. (1808) 321 Sulphuretted hydrogenous waters. 1802 Med. Jrnl. VIII. 522 That an animal died immediately on inspiring hydrogenous sulphurated gas. 1848 Grove Contrib. Sc. in Corr. Phys. Forces 349 The differences between the hydrogenous and the other gases. 1878 Newcomb Pop. Astron. iii. ii. 267 The structure of the hydrogenous protuberances. |
▪ II. hydrogenous, a.2 Geol.
(haɪˈdrɒdʒɪnəs)
[f. hydro- + -genous.]
Of a mineral, deposit, etc.: formed by the (chemical) action of water.
| 1889 in Cent. Dict. 1954 Jrnl. Geol. LXII. 260/2 The ratio in manganese nodules, which are presumed to be almost entirely hydrogenous, averages 150, whereas in igneous rocks the ratio of 20 is reported. 1981 E. Bonatti in C. Emiliani Oceanic Lithosphere xvii. 641 Hydrogenous deposits..are formed on the sea floor by precipitation of metals derived mainly from seawater. |
Hence hyˈdrogenously adv.
| 1974 Nature 11 Oct. 473/2 Some metals may be released into the water column at mid-ocean ridges by hydrothermal circulation and others may be hydrogenously deposited in the Bauer Deep. |