Meaning of 通妻 in Japanese

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Definition of 通妻

つま(tsuma) 【妻 ·夫 ·具】

(n) wife
男は妻が車で駅で待つことにした。
The man decided to wait at the station until his wife came.
dear (formerly used by romantically linked men and women to refer to one another)
garnish (esp. one served with sashimi)
embellishment

つう(tsuu) 【通】

(adj-na, n) connoisseur; authority
コーヒー通の人達に結構評判がいいそうです。
I hear that it has quite the reputation with coffee connoisseurs.
(ctr) counter for letters, notes, documents, etc.