poke「突く」、-er「動作を与える」から、カードゲームを指す言葉として使われる。ポーカーの語源は定かではないが、ギャンブルの常套手段であるラッシュ(自慢話)から派生したpokeが、後にこのカードゲームを指すようになったのかもしれない。
A good player is cautious or bold by turns, according to his estimate of the capacities of his adversaries, and to the impression he wants to make on them. 7. It follows that the possession of a good poker face is an advantage. No one who has any pretensions to good play will betray the value of his hand by gesture, change of countenance, or any other symptom. ["Cavendish," "Round Games at Cards," dated 1875]
To any one not very well up in these games, some parts of the book are at first sight rather puzzling. "It follows," we read in one passage, "that the possession of a good poker face" (the italics are the author's) "is an advantage." If this had been said by a Liverpool rough of his wife, the meaning would have been clear to every one. Cavendish, however, does not seem to be writing especially for Lancashire. [review of above, "Saturday Review," Dec. 26, 1874]