名詞 retina:

1. the light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve

1. The condition of the normal eye when parallel rays are focused exactly on the retina and vision is perfect.
   屈光正常當(dāng)平行光線恰好聚焦于視網(wǎng)膜并形成清晰視覺時(shí)正常眼睛的狀態(tài)
2. A unit of retinal illumination, equal to the amount of light that reaches the retina through 1 square millimeter of pupil area from a surface having a brightness of 1 candela per square meter.
   光度視網(wǎng)膜亮度單位，相當(dāng)于每平方米有一燭光亮度的表面，通過(guò)一平方毫米的瞳孔區(qū)域，到達(dá)視網(wǎng)膜的光線數(shù)量
3. The optical system of the eye stimulate cell of the retina.
   眼睛的視覺系統(tǒng)刺激視網(wǎng)膜內(nèi)的細(xì)胞。
4. Sight is made possible by rays of light impinging on the retina.
   由於光線射到視網(wǎng)膜上，眼睛才看得見。

ret.i.na

n.（名詞）
【復(fù)數(shù)】 ret.i.nas 或 ret.i.nae [rμt.n-ô.]
A delicate, multilayered, light-sensitive membrane lining the inner eyeball and connected by the optic nerve to the brain.
視網(wǎng)膜：襯于內(nèi)眼球的精細(xì)、多層、能感光的膜，并通過(guò)視神經(jīng)連接大腦

來(lái)源：
Middle English
中古英語(yǔ)
from Medieval Latin rôtina
源自 中世紀(jì)拉丁語(yǔ) rôtina
from Latin rôte [net]
源自 拉丁語(yǔ) rôte [網(wǎng)]

【引伸】
ret.inal
adj.（形容詞）