A substance that resembles a crystal in appearance but lacks the ordered atomic structure of a true crystal, sometimes also called amorphous.
From 'crystal' combined with the Greek suffix '-oid' meaning 'resembling or like.' This term was coined in the 19th century to describe materials that looked crystalline but behaved differently.
Glass is the most famous crystallod—it looks like a solid crystal but is actually a frozen liquid with atoms jumbled randomly, which is why it flows imperceptibly over centuries and why old windows are sometimes thicker at the bottom!
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