Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Ectypus

（ἔκτυπος), properly an adjective,

Ectypum. (British Museum.)

“formed in a mould” (τύπος, forma), or “wrought in high relief,” thus distinguished from ἀνάγλυφος, “in low relief.” Hence

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1.

the noun ectypum, a cast in plaster or terra-cotta, which presents the objects in relief (Plin. H. N. xxxv. 152). The accompanying examples are from a terra-cotta and mould in the British Museum.

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2.

Ectypa gemma (Sen. Ben. iii. 26) or scalptura (Plin. H. N. xxxvii. 173), an engraved stone cut in relief, now called a cameo. See Caelatura; Gemma.