cumulus

• n. [気象学]積雲; 盛り上がる; 積み重なる

PIE*keueの「膨らむ」「積み重なる」が語源で、語源的にはchurchやcaveと同じ。

cumulus (n.)

1650s, "a heap," from Latin cumulus "a heap, pile, mass, surplus," from PIE *ku-m-olo-, suffixed shortened form of root *keue- "to swell" (compare Sanskrit svayati "swells up, is strong," Greek kyein "to swell," Lithuanian ?aunas "firm, solid, fit, capable"). Meteorological use for "rounded mass of clouds" first attested 1803.

1. Around midday，the fog lifted and puffy cumulus clouds appeared across the sky.

昼ごろに霧が晴れ、満天にふわふわとした積雲が現れた。

2.From his bed he could see the great cumulus clouds that hung in the blue sky.

ベッドに横になると、青い空に大きな塊状の積雲が浮かんでいるのが見えます。

3.A polar landscape of snowy hills，dramatic cumulus clouds and coastal glaciers.

雪域丘陵、目を引く積雲、沿海氷河の極地景観。

4.Piles of cotton-like cumulus clouds fill the sky a clear day.

快晴の空には綿のような積雲が積もっている。

5. Cumulus clouds billow over the landscape near Cedar City，Utah.

ユタ州、錫達城の近くで、積雲が地上を覆っている。