pandect

Sense 3 (“comprehensive treatise”) is from Latin pandectēs (“book that contains everything, encyclopedia”), from Ancient Greek πανδέκτης (pandéktēs, “encyclopedia”, literally “all-receiver”), from παν- (pan-, prefix meaning ‘all’) (from πᾶς (pâs, “all”)) + δέκτης (déktēs, “receiver, recipient”) (from δέχομαι (dékhomai, “to receive”) (from Proto-Indo-European *deḱ- (“to take; to perceive”)) + -της (-tēs, suffix forming agent nouns)).

Sense 1 (“compendium of writings on Roman law”) in the plural form Pandects is from Late Latin pandectae (“the Pandects”), the plural of pandectēs, modelled after (Byzantine) Ancient Greek πανδέκται (pandéktai, “the Pandects”), the plural of πανδέκτης (pandéktēs): see further above.