different between hummock vs undulation

English

Etymology

Unknown, but probably a diminutive of hump, equivalent to hump +? -ock (diminutive suffix). Compare hillock.

Noun

hummock (plural hummocks)

1. A small hill; a hillock; a knoll.
2. A ridge or hill of ice in an ice field.
3. (Scotland) A fistful.

Related terms

• hummocked
• hummocking
• hummocky

Translations

References

• hummock on Wikipedia.Wikipedia

English

Etymology

undulate +? -ion, or borrowed from Medieval Latin undul?ti?; compare French ondulation.

Pronunciation

• Rhymes: -e???n

Noun

undulation (countable and uncountable, plural undulations)

1. An instance or act of undulating.
   • 1929, Robert Dean Frisbee, The Book of Puka-Puka (republished by Eland, 2019; p. 77):

     But the next undulation would raise us, showing the island ablaze in the sunlight, an emerald of dazzling beauty resting lightly on the bosom of the sea.

2. A wavy appearance or outline; waviness.
3. (music) A tremulous tone produced by a peculiar pressure of the finger on a string.
4. A wavelike curve; a smooth and regular rise and fall.
5. A wavelike motion of the air; electromagnetic radiation.
6. (medicine, dated) A feeling as if of an undulatory motion about the heart.
7. (medicine, dated) The distinctive motion of the matter within an abscess on being pressed when it is ripe for opening.

Derived terms

• undulationist

Translations

References

• undulation in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.