名詞 elastic:

1. a narrow band of elastic rubber used to hold things (such as papers) together
   同義詞：rubber band, elastic band
2. a fabric made of yarns containing an elastic material

形容詞 elastic:

1. capable of resuming original shape after stretching or compression; springy
2. able to adjust readily to different conditions
   同義詞：flexible, pliable, pliant

1. The strong, elastic wood of this tree, used for furniture, tool handles, and sporting goods such as baseball bats.
   木，白蠟木這種樹的堅硬有彈性的木材，用于(制作)家具、工具柄、運動器材如板球拍等
2. He has an elastic temperament.
   他有開朗的性情。
3. Rubber is elastic.
   橡皮是有彈性的。

e.las.tic

adj.（形容詞）

Easily resuming original shape after being stretched or expanded; flexible.See Synonyms at flexible
柔韌的，有彈性的：伸長或擴展后容易恢復原狀的；柔韌的參見 flexible
Springy; rebounding.
有彈力的；有彈性的
Physics Returning to or capable of returning to an initial form or state after deformation.
【物理學】 彈回的：在形變以后恢復或能夠恢復原來形狀或狀態(tài)的
Quick to recover, as from disappointment:
能恢復的：迅速恢復的，如從失望情緒中恢復：
例句：
an elastic spirit.
開朗的精神

Capable of adapting to change or a variety of circumstances.
靈活的：能夠順應變化或不同情況的
n.（名詞）

A flexible, stretchable fabric made with interwoven strands of rubber or an imitative synthetic fiber.
彈性織物：由橡皮線或類似的合成材料織成的柔韌的容易拉伸的織物
An object made of this fabric.
彈性織品：由這種織物制成的物品
A rubber band.
橡皮帶

來源：
New Latin elasticus
現(xiàn)代拉丁語 elasticus
from Late Greek elastos [beaten, ductile]
源自 后期希臘語 elastos [錘制的，可伸展的]
variant of Greek elatos
希臘語 elatos的變體
from elaunein [to beat out]
源自 elaunein [錘制]

【引伸】
elas.tically
adv.（副詞）