microsphere


mi·cro·sphere

noun \ˈmī-krə-ˌsfir\

Definition of MICROSPHERE

:  a minute sphere
mi·cro·spher·i·cal \ˌmī-krə-ˈsfir-i-kəl, -ˈsfer-\ adjective

First Known Use of MICROSPHERE

1894

mi·cro·sphere

noun \-ˌsfir\   (Medical Dictionary)

Medical Definition of MICROSPHERE

: a spherical shell that is usually made of a biodegradable or resorbable plastic polymer, that has a very small diameter usually in the micron or nanometer range, and that is often filled with a substance (as a drug or antibody) for release as the shell is degraded

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