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Webster 1913 Edition

Noun.

[From

a kind of rock.]

(Min.)

Of or performance to trap; resembling trap, or partaking of its form or qualities; trappy.

Adj.

[from trap,in geology. It ought to be trappy.]

Pertaining to trap; resembling trap, or partaking of its form or qualities.

trappous ‎(comparative more trappous, superlative most trappous)