名詞 flexion:

1. the state of being flexed (as of a joint)
   同義詞：flexure, flection
2. deviation from a straight or normal course
   同義詞：inflection, flection
3. act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased
   同義詞：flexure

flex.ion

n.（名詞）
Also flec.tion Anatomy
也作 flec.tion 【解剖學】
The act of bending a joint or limb in the body by the action of flexors.
屈體：通過屈肌運動而彎曲身體關節(jié)或四肢的行為
The resulting condition of being bent.
彎曲的狀態(tài)
A part that is bent.
彎曲：彎曲的部分

來源：
Latin flexiô flexiôn- [a bending]
拉丁語 flexiô flexiôn- [彎曲]
from flexus [past participle of] flectere [to bend]
源自 flexus [] flectere的過去分詞 [彎曲]