dominant hand

Impulse by Dr David Lewisを読んでいます。
Discover your own risk ratio
To calculate your 2D:4D ratio all you have to do is to measure the second and fourth digits of your dominant hand (i.e. right hand if right-handed) as shown in figure 1.
"right-handed" とか "southpaw" と言う英語しか知りませんでしたが、上の引用文に出てきた "dominant hand" は文脈から利き手の意味であることは容易に推測できます。辞書で確かめようとしましたが、OneLookの検索では百科事典のWikipediaが "dominant hand" の検索で次の "Handedness" の説明箇所のみを示していました。
Handedness is a better (faster or more precise) performance or individual preference for use of a hand, known as the dominant hand; the less capable or less preferred hand is called the nondominant hand. Handedness is not a discrete variable (right or left), but a continuous one that can be expressed at levels between strong left and strong right.
なるほど、"dominant hand" とも言うが一般的には "handedness" が普通に使われるのですね。 "handedness" ならどの辞書にも説明があります。
・Oxford English Dictionary: The tendency to use either the right or the left hand more naturally than the other.: injury has forced him to change his handedness
・Collins Dictionary: ability in using one hand more skillfully than, and in preference to, the other: He even believes that the census should contain a question on handedness.
ここで気になりました、"handedness" だと手についてなので、足については "B>footedness" と言うのかなと？　辞書で確認します。
・Merriam-Webster's Online Dictionary: the dominance of one foot over the other: ambidexterity and mixture of eyedness, handedness, and footedness
・Free Dictionary: the property of favoring one foot over the other (as in kicking a ball)