名詞 oscitancy:

1. drowsiness and dullness manifested by yawning
   同義詞：oscitance
2. an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom
   同義詞：yawn, yawning, oscitance

os.ci.tan.cy

n.（名詞）
【復(fù)數(shù)】 os.ci.tan.cies
The act of yawning.
打呵欠：打哈欠的動(dòng)作
The state of being drowsy or inattentive; dullness.
困倦：昏昏欲睡或不經(jīng)心的狀態(tài)；懶散

來源：
From oscitant [yawning]
源自 oscitant [哈欠]
from Latin ôscit3ns ôscitant- [present participle of] ôscit3re [to yawn]
源自 拉丁語 ôscit3ns ôscitant- [] ôscit3re的現(xiàn)在分詞 [打哈欠]
ôs [mouth] * see ôs-
ôs [口] *參見 ôs-
cit3re [to move] * see kei- 2
cit3re [移動(dòng)] *參見 kei- 2

【引伸】
os.citant
adj.（形容詞）