iso-, is-

(Greek: equal; by extension: same, similar, alike; normally used as a prefix)

Used in numerous terms, nearly all scientific; denoting: equality, similarity, uniformity, or identity; the second element being properly and usually of Greek origin, rarely of Latin [the proper prefix in the latter case being equi-]. In biology, denoting for or from different individuals of the same species). For a large list of iso- opposites or antonyms, see aniso-.

Relating to a diagram exhibiting the course of the mean monthly temperature of a place for each hour of the day.
1. An underground isotherm, or a line drawn on a weather map that connects places with the same temperature.
2. A line connecting points of equal or constant temperatures on the surface of the earth.
isacoustic (adjective), more isacoustic, most isacoustic
1. Applied to a curve passing through those points (in a theater, concert-room, etc.) at which a speaker or performer may be heard equally well: "Terry always chooses the most isacoustic seat in the auditorium so she can hear the speakers."
2. A reference to the equal intensity of sound: "The natural acoustics of the outdoor amphitheater provided balanced isacoustic music."
3. In seismology, applied to a line (imaginary or on a map) connecting places where an equal percentage of observers hear the sound of an earthquake: "The seismologists at three universities realized that their institutions were situated on an isacoustic line meaning that they each could hear quakes equally well when they occur."
In botany, having diadelphous stamens with the same number in each bundle.
A line on a weather chart connecting points of equal change of atmospheric pressure within a specified time period commonly used on synoptic surface charts to depict three-hourly local pressure tendencies.
Of or relating to equal or constant pressure change, referring specifically to either the distribution of equal pressure tendency in space or the constancy of pressure tendency with time.
A line on a weather chart connecting points of equal change of temperature within a specified time period.
In botany, of a flower, having stamens that are alike and are of a quantity equal to the number of petals.
isanthous, isantherous
Bearing symmetric flowers.
isoagglutination, isoagglutinative
Agglutination (clumping together) of an agglutinogen (usually red blood cells) of one individual (human or animal) by the serum of another of the same species.
isobar, isobaric
1. A line connecting places on the earth’s surface having the same barometric pressure at a given time or for a given period.
2. A line on a chart, or map, connecting points of equal atmospheric or hydrostatic pressure.
1. Having the same depth; of equal depth.
2. A line (either imaginary or on a map) joining places where water has equal depth; an underwater (bathymetric) contour.
isobathythermic, isobathythermal
A reference to a line connecting points having the same temperature in a vertical section of any part of the sea (also isothermobath).
Having the two sides equal and alike; applied to bilaterally symmetrical leaves in which there is no evident distinction of upper and under surface, as in some species of Iris.
A boundary line on a map connecting world environments that have similar floral and faunal constituents.

Inter-related cross references, directly or indirectly, involving word units dealing with "equal, identical, same, similar": auto-; emul-; equ-, equi-; homeo-; homo-; pari-; peer; rhomb-; syn-; tauto-.