chain of self-service grocery stores, started 1916 in Memphis, Tennessee. According to founder's reminiscence from 1921, an arbitrary coinage, simply "something different from anything used before" ["Current Opinion"].
pigeon
pigeon-hole
pigeon-toed
pigeon-wing
piggish
Piggly-Wiggly
piggy
piggyback
pig-headed
piglet
pigment
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