Scrabble Dictionary

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Yes, entrain is playable

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"Entrain" Definition

verb-transitive

Chemistry To carry (suspended particles, for example) along in a current.
To pull or draw along after itself.
To put aboard a train.

verb-intransitive

To go aboard a train.

verb

To go aboard a train.
To put aboard a train.
To determine or modify the phase or period of .
To incorporate (air bubbles) into concrete.
To draw in and transport (as solid particles or gas) by the flow of a fluid.