名詞 pectoral:

1. either of two large muscles of the chest
   同義詞：pectoral muscle, pectoralis, musculus pectoralis, pecs
2. an adornment worn on the chest or breast
   同義詞：pectoral medallion

形容詞 pectoral:

1. of or relating to the chest or thorax
   同義詞：thoracic

pec.to.ral

adj.（形容詞）
Relating to or situated in the breast or chest:
胸的，胸部的：有關(guān)或位于胸或胸部的：
例句：
a pectoral muscle; the pectoral cavity.
胸肌；胸腔

Useful in relieving disorders of the chest or respiratory tract.
祛痰的，舒胸的：有助于緩解胸部或呼吸道不適的
Worn on the chest or breast:
佩于胸前或胸部的：
例句：
a pectoral cross.
佩于胸前的十字架

n.（名詞）
A muscle or an organ of the chest.
胸部的肌肉或器官
A pectoral fin.
胸鰭
A medicine for relieving disorders of the chest or respiratory tract.
祛痰藥，舒胸藥：一種用于緩解胸部或呼吸道不適的藥物
An ornament or a decoration worn on the chest.
胸飾，胸鎧，胸章，胸針：佩于胸前的裝飾品或勛章

來源：
Probably Latin pector3lis
可能為 拉丁語 pector3lis
from pectus pector- [breast]
源自 pectus pector- [胸]
N., sense 4, Middle English
名詞釋義4， 中古英語
from Old French
源自 古法語
from Latin pector3le [breastplate] [from neuter of] pector3lis [pectoral]
源自 拉丁語 pector3le [護(hù)胸甲] [] 源自pector3lis的中性詞 [胸的]