Describing a material, usually a polymer or mineral, that is partially crystalline with some regions having ordered crystal structure and others being amorphous.
From Greek 'hemi-' meaning half and Latin 'crystallinus' meaning clear or icy. This materials science term emerged in the 1900s as polymer chemistry developed.
Hemicrystalline polymers like polyethylene are partially crystalline, which gives them unique properties—they're stronger than purely amorphous plastics but more flexible than fully crystalline ones, making them perfect for plastic bags and bottles.
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