HITHER a.
Applied to time: On the hither side of, younger than; of fewer years than. And on the hither side, or so she looked, Of twenty summers. Tennyson. To the present generation, that is to say, the people a few years on the hither and thither side of thirty, the name of Charles Darwin stands alongside of those of Isaac Newt…
HOMOLOGY n.
ttended by a regular variation in physical properties; as, there is an homology between methane, CH4, ethane, C2H6, propane, C3H8, etc., all members of the paraffin series. In an extended sense, the term is applied to the relation between chemical elements of the same group; as, chlorine, bromine, and iodine are said t…
HYDROCARBON n.
A compound containing only hydrogen and carbon, as methane, benzene, etc.; also, by extension, any of their derivatives. Hydrocarbon burner, furnace, stove, a burner, furnace, or stove with which liquid fuel, as petroleum, is used.
HYDROGEN n.
less, and odorless, the lightest known substance, being fourteen and a half times lighter than air (hence its use in filling balloons), and over eleven thousand times lighter than water. It is very abundant, being an ingredient of water and of many other substances, especially those of animal or vegetable origin. It ma…