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-.

In cartography, a line on a map or chart drawn through all points on the earth’s surface that have equal grivation (grid variation).
Having pistils or carpels equal in number to the parts of the perianth.
A line (imaginary or on a chart), or an imaginary surface, connecting points that have the same or equal salinity.
A line on a map or chart connecting points at which the waters of the sea have an equal degree of saltiness.
isohel, isohelic
A line (imaginary or on a map) connecting points having the same amount or duration of sunshine.
isohyetal, isohyetose
A line on a map, etc., connecting places having equal annual or seasonal rainfall.
Immunization of an individual by the introduction of antigens from another individual of the same species.
1. Having thunderstorm phenomena of equal frequency or severity, or simultaneous occurrence.
2. A line on a map that connects places of equal thunderstorm frequency.
Designating areas over which the keraunographic records of thudnerstorm phenomena are the same or similar.
Designating areas over which thunderstorm discharges are audible in the keraunophone with equal intensity.
Characterized by no disturbance to the speed and direction of a fluid when it is withdrawn as a sample from a flow.
Having equal sides.
isolex, isolexic, isolectic
A line connecting places in which there is uniformity of vocabulary.
isolume (s) (noun), isolumes (pl)
1. A line on a chart or a map that connects points of equal shining intensity: Astronomy students were utilizing the presentation of the isolumes in order to analyze the various degrees of brightness of the planets and the stars.
2. An intense or strong effulgence of nature; such as, from the sun: Some sea animals follow isolumes up and down water columns.

As sunlight decreases in the late afternoon, an isolume moves toward the sea surface, and the migrating community follows such radiance with a precision seldom seen in other natural populations.

Daily or seasonal changes in an isolume, or lucid intensity, seems to be the most likely stimulus for vertical migrations of some sea creatures.

1. In optics, a curve, line, or surface whose points all have equal light intensity.
2. A curve or surface connecting points at which light intensity is the same. Also known as, isofootcandle, isophot.

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-.