a. 可遵守的, 可庆祝的, 看得见的, 可辨别的, 观测得到的, 值得注意的, 显著的

n. 感觉到的事物, 现象

[化] 可观察量

[ adj ]
capable of being seen or noticed
<adj.all>
a discernible change in attitudea clearly evident erasure in the manuscript
an observable change in behavior

Observable \Ob*serv"a*ble\, a. [L. observabilis: cf. F.
observable.]
1. Capable of being observed; discernible; noticeable. --Sir.
T. Browne.

The difference is sufficiently observable.
--Southey.

2. Worthy of being observed; important enough to be noted or
celebrated; as, an observable anniversary.
[PJC]

3. Noteworthy; remarkable.
[PJC] -- {Ob*serv"a*ble*ness}, n. -- {Ob*serv"a*bly}, adv.