sculls is a form of:

Scull



noun
1.
(a kind of short oar, light racing boat of a long, narrow build) rowin a scull ទូកអុំយ៉ាងតូច, work a scull ចែវ
verbpast tense: sculled ; past participle: sculled ; present participle: sculling ;
1.
(INTRANSITIVE) (to propel boat by two sculls; to propel boat by means of placed over stem; sculls race involving such boats) ចែវទូកពីកន្សៃទូក, ចែវ
ENGLISH MEANING
noun
1.
A shoal of fish.
2.
One of a pair of short oars worked by one person.
3.
A single oar used at the stern in propelling a boat.
4.
The common skua gull.
verbpast tense: sculled ; past participle: sculled ; present participle: sculling ;
1.
(INTRANSITIVE) To impel a boat with a scull or sculls.
2.
(TRANSITIVE) To impel (a boat) with a pair of sculls, or with a single scull or oar worked over the stern obliquely from side to side.
1.
The skull
2.
A boat, a cockboat