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n. [ Iso- + Gr. &unr_; summer, &unr_; to heat. ] (Phys. Geog.) A line connecting points on the earth's surface having the same mean summer temperature. [ 1913 Webster ]

n. [ Iso- + Gr. &unr_; heat, fr. &unr_; hot. ] 1. (Phys. Geog.) A line connecting or marking points on the earth's surface having the same temperature. This may be the temperature for a given time of observation, or the mean temperature for a year or other period. Also, a similar line based on the distribution of temperature in the ocean. [ 1913 Webster ]

2. (Physics) A line on a graph connecting points representing states having the same temperature; an isothermal line. [ PJC ]

a. [ Cf. F. isotherme. ] (a) Relating to equality of temperature, or an isotherm. (b) (Phys. Geog.) Having reference to the geographical distribution of temperature, as exhibited by means of isotherms; as, an isothermal line; an isothermal chart. [ 1913 Webster ]

Isothermal line. (a) An isotherm. (b) A line drawn on a diagram of energy such that its ordinates represent the pressures of a substance corresponding to various volumes, while the absolute temperature is maintained at a constant value. --
Isothermal zones, spaces on opposite sides of the equator having the same mean temperature, and bounded by corresponding isothermal lines. [ 1913 Webster ]

n. [ Iso- + Gr. &unr_; hot + &unr_; depth. ] (Phys. Geog) A line drawn through points of equal temperature in a vertical section of the ocean. [ 1913 Webster ]

a. Of or pertaining to an isothermobath; possessing or indicating equal temperatures in a vertical section, as of the ocean. [ 1913 Webster ]

n. [ Iso- + Gr. qe`ros summer + 'o`mbros rain. ] (Phys. Geog) A line connecting or marking points on the earth's surface, which have the same mean summer rainfall. [ 1913 Webster ]

‖n. [ NL., fr. Gr. me`sos middle + &unr_; box. ] (Zool.) The middle layer of the gonophore in the Hydrozoa. [ 1913 Webster ]

‖n. [ NL., fr. Gr. me`sos middle + E. epithelium. ] (Biol.) Epithelial mesoderm; a layer of cuboidal epithelium cells, formed from a portion of the mesoderm during the differetiation of the germ layers. It constitutes the boundary of the cœlum. [ 1913 Webster ]

n. [ Gr. misei^n to hate + qeo`s god. ] Hatred of God. De Quincey. [ 1913 Webster ]