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From Ancient Greek πλαστικός (plastikós, “shapable, mouldable”).
By surface analysis, plast(ēs) (“shaper”, “moulder”) +‎ -icus (adjective-forming suffix).

plasticus (feminine plastica, neuter plasticum); first/second-declension adjective

First/second-declension adjective.

	masculine	feminine	neuter	masculine	feminine	neuter
	singular			plural
nominative	plasticus	plastica	plasticum	plasticī	plasticae	plastica
genitive	plasticī	plasticae	plasticī	plasticōrum	plasticārum	plasticōrum
dative	plasticō	plasticae	plasticō	plasticīs
accusative	plasticum	plasticam	plasticum	plasticōs	plasticās	plastica
ablative	plasticō	plasticā	plasticō	plasticīs
vocative	plastice	plastica	plasticum	plasticī	plasticae	plastica

“plasticus”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
"plasticus", in Charles du Fresne du Cange, Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
“plasticus”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.

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