de-
/dɪ/prefix
1
- (forming verbs and their derivatives) down; away构成动词及其派生词表示“向下”, “在远处”：
descend
deduct
1.1
- completely表示“完全地”：
denude
derelict
2
- (added to verbs and their derivatives) denoting removal or reversal加在动词及其派生词之后表示“除去”, “相反”：
deaerate
de-ice.
3
- denoting formation from表示“由…构成”：
deverbal.
词源
from Latin de 'off, from'; sense 2 via Old French des- from Latin dis-.