| isotropic | <radiobiology> Adjective which describes a medium whose physical properties are independent of the direction in which they are measured. (09 Oct 1997) |
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| isotropic disk | <cell biology> The isotropic band of the sarcomere of striated muscle, where only thin filaments are found. Unlike the A band, the I band can vary in width depending upon the state of contraction of the muscle when fixed. (18 Nov 1997) |
| isotropic environment | Environments in which the properties are the same at all points and there are no vectorial or axial cues. (18 Nov 1997) |
| isotropic lipid | A lipid occurring in the form of singly refractive droplets. (05 Mar 2000) |