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Webster 1913 Edition

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Adj.

Of or pertaining to porcelain; resembling porcelain;

as,

porcelaneous

shells

(Zool.)

Having a smooth, compact shell without pores; – said of certain Foraminifera.

Adj.

[from porcelain.] Pertaining to or resembling porcelain; as porcellaneous shells.

porcellaneous ‎(comparative more porcellaneous, superlative most porcellaneous)

Of or relating to porcelain; resembling porcelain.
(zoology) Having a smooth, compact shell without pores; said of certain Foraminifera.