A chemical radical or group derived from amylene by the removal of two hydrogen atoms.
From amyl- plus -idene (a suffix indicating a bivalent radical or chemical group with two bonding sites). The -idene suffix comes from the pattern of methylene, ethylidene, and other similar chemical groups.
Chemical suffixes tell a story: -yl means one bonding site, -ylidene means two bonding sites, and -ylidyne means three! It's like chemistry is giving you a numerical hint about how many connections something can make.
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