interstellar distance measure, 1913, from first elements of parallax second. It is the distance at which an object has parallax (viewed from Earth at an interval of six months and halved) of one second of arc, or about 3.26 light-years.
parricide
parrot
parrot-fish
parry
parse
parsec
Parsee
parsimonious
parsimony
parsley
parsnip
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