referral
n.
1920, "act of referring," from refer + -al(2). Especially to an expert or specialist (a sense attested from 1955). Earlier word was referment (1550s).
| 词汇 | referral | 
| 词根词缀 | Online Etymology Dictionary referral n. 1920, "act of referring," from refer + -al(2). Especially to an expert or specialist (a sense attested from 1955). Earlier word was referment (1550s). | 
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