Other forms: hillocks
A hillock is a very small hill. A grassy hillock, stand on the hillock, a hillock in the field.
The -ock ending is a diminutive that English has almost stopped using, surviving in hillock, bullock and a handful of others. In a field a hillock is often a burial mound or the site of something long gone.
1nounhillockA very small hill.
“We sat on a grassy hillock and watched the sun go down over the fields.”
hillock is a hill.
Middle English hillok is hill plus the diminutive ending -ock.
Middle English
hillok
English, today
hillock
From Middle English hillok, equivalent to hill + -ock.
Etymology from Wiktionary, CC BY-SA