A six-pointed spicule (needle-like skeletal structure) found in certain sponges and other marine organisms.
From 'hexa-' (six) plus '-act' from Greek 'aktis' meaning ray or point. This technical term was established in marine biology to describe specific sponge skeletal elements.
Sponges basically build their skeletons using different types of needles, and a 'hexact' is a six-pointed needle—it's like nature's titanium building blocks, but made from silica and arranged in perfect geometric patterns.
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