Origin of hecto-Fr, contr from Classical Greek hekaton, hundred
Origin of hecto-French alteration of Greek hekaton hundred ; see dek&mlowring; in Indo-European roots.
This prefix is not used in official scientific contexts. For example, "1 hm" (one hectometre) is written instead as either "100 m" or "0.1 km".
From French, from Ancient Greek ἑκατόν (hekaton, “hundred”).