出典:Wiktionary
From pendulum, by analogy with Latin second declension nouns, such as bacterium/bacteria, though Latin pendulum is the neuter singular form of the adjective pendulus, whose neuter plural is indeed pendula.
The form pendulums is significantly more common than pendula; however, pendula is occasionally used in physics, particularly in the phrase "coupled pendula."
pendula
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支払済み
ウスグロチャタテ
ふた
パタス
プーク
ピルチャード
rudds
pelicans
condors
ぱかり