名詞 reflex:

1. an automatic instinctive unlearned reaction to a stimulus
   同義詞：instinctive reflex, innate reflex, inborn reflex, unconditioned reflex, physiological reaction

形容詞 reflex:

1. without volition or conscious control
   同義詞：automatic, reflexive

1. Motor coordination; a motor reflex.
   肌肉運動的協(xié)調(diào); 肌肉運動反射
2. A tonic reflex.
   肌肉緊張反射
3. It's just a dog's reflex movement.
   這正是狗的反射運動。

re.flex

adj.Abbr. refl.（形容詞）縮寫 refl.
Bent, turned, or thrown back; reflected.
彎折的，反射的：彎折的，逆轉(zhuǎn)的或拋回的；反射的
Physiology Being an involuntary action or response, such as a sneeze, blink, or hiccup.
【生理學(xué)】 反射作用的：如打噴嚏、眨眼或打嗝等不自愿的行為或反應(yīng)的
Produced as an automatic response or reaction:
本能的：作為自動的反應(yīng)而產(chǎn)生的：
例句：
reflex opposition to change.
對變化本能的抗拒

n.Abbr. refl.（名詞）縮寫 refl.

Something, such as light or heat, that is reflected.
被反射物：如光或熱等被反射的物質(zhì)
An image produced by reflection.
映像：通過反射產(chǎn)生的形象
A copy or reproduction.
復(fù)印，復(fù)制
Physiology An involuntary response to a stimulus.
【生理學(xué)】 反射作用：對刺激的非自愿的反應(yīng)
Psychology An unlearned or instinctive response to a stimulus.
【心理學(xué)】 本能反應(yīng)：對于刺激無須學(xué)習(xí)或本能的反應(yīng)
Linguistics A form or feature that reflects or represents an earlier, often reconstructed, form or feature having undergone phonetic or other change.
【語言學(xué)】 反映形式：反映或代表以前的、通常重新構(gòu)成并經(jīng)歷了語音或其他變化的形式或特點
v.tr.（及物動詞）
re.flexed,re.flex.ing,re.flex.es[r-flμks.] 縮寫 refl.
To bend, turn back, or reflect.
反折，反曲，反射
To cause to undergo a reflex process.
使反射：引起或經(jīng)過反射作用的過程

來源：
From Middle English reflexen [to refract light, bend back]
源自 中古英語 reflexen [反射光線；折回]
from Latin reflexus [past participle of] reflectere [to bend back] * see reflect
源自 拉丁語 reflexus [] reflectere的過去分詞 [折回] *參見 reflect