| 单词 | saccade |
| 释义 | saccade /sa kahd", seuh-/, n. 1. the act of checking a horse quickly with a single strong pull of the reins. 2. Ophthalm. the series of small, jerky movements of the eyes when changing focus from one point to another. [1720-30; < F saccade jerk, jolt, orig., movement of a horseman who abruptly pulls the reins, equiv. to MF saqu(er) to pull violently (N dial. var. of OF sachier, ult. deriv. of sac SACK1, hence presumably with sense "withdraw from a sack") + -ade -ADE1] |
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