mola (n.2) Look up mola at Dictionary.com
"false conception," c. 1600, from Latin mola "false conception," from earlier sense "salt cake;" literally "millstone" (from PIE root *mele- "to crush, grind").
mola (n.1) Look up mola at Dictionary.com
type of fish, 1670s, from Latin mola, literally "millstone" (from PIE root *mele- "to crush, grind"). So called because of the fish's shape and rough skin.