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-.

Producing equal amounts of vital energy.
Binary digits having the same value.
A line drawn through geographical points at which a given phase of thunderstorm activity ooccurred simultaneously.
isobryous, isobrious
In botany, growing with equal vigor on both sides; applied to a dicotyledonous embryo.
isocapnia (s) (noun), isocapnias (pl)
A state in which the arterial carbon dioxide pressure remains constant or unchanged.
isocarpic, isocarpous
Having the same number of carpels (pistils) and perianth (petal) divisions.
isocephalic, isocephalous, isocephalic
In art, having the heads of the principal figures (whether seated, or standing, or mounted on horses) arranged in one horizontal line or nearly so; said especially of Greek bas-reliefs and friezes.
isoceraunic, isokeraunic
Indicating or having equal frequency or intensity of thunderstorm activity. An isoceraunic line is a line drawn through geographical points at which some phenomenon connected with thunderstorms has the same frequency or intensity; used for lines of equal frequency of lightning discharges.
A line connecting points on the earth’s surface at which the aurora is observed with equal frequency.
isocheime, isochime
A line connecting places on the earth’s surface having the same mean winter temperature.
1. Of uniform color.
2. Denoting two objects of the same color.
3. In optics, having the same color.
isochromatophil, isohromatophile (s) (noun); isochromatophils; isohromatophiles (pl)
A substance that has an equal affinity for the same dye: An isochromatophil can be a cell or a tissue that can be stained with the same dye.
An abnormal chromosome with two identical arms due to duplication of one arm and loss of the other arm.

Isochromosomes are found in some girls with Turner syndrome (chromosome disorder in females that is characterized by the absence of all or part of a second sex chromosome in some or all cells), patients with the Pallister-Killian syndrome (a condition with multiple malformations at birth and mental retardation), and some tumors.

isochronal, isochronous (adjective) (not comparable)
1. Referring to something taking place in uniform time or at regular intervals: All the periods or classes in school were isochronal because each one of them lasted exactly 45 minutes and followed by a break of 10 minutes.
2. Pertaining to things equal in time; contemporary; occurring during the same time: Mary had two clocks with pendulums which were isochronous and swung back and forth at the same time and kept perfect time!
isochrone (s) (noun), isochrones (pl)
A line on a chart connecting all points having the same time of occurrence of particular phenomena or of a particular value of a quantity: An isochrone on the map linked the towns and cities from which it would take exactly the same time for Mary and Dick to travel to their destination.

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-.