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From Biology-Online Dictionary | Biology-Online Dictionary
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1. To dye in grain, or of a fast colour. See ingrain. Leaves engrained in lusty green. (Spenser)

2. To incorporate with the grain or texture of anything; to infuse deeply. See ingrain. The stain hath become engrained by time. (Sir W. Scott)

3. To colour in imitation of the grain of wood; to grain. See grain.

Origin: Pref. En- _ grain. Cf. Ingrain.