Definition of hash mark in English:

hash mark

Syllabification: hash mark

Entry from US English dictionary

noun

1A service stripe worn on the left sleeve of an enlisted person’s uniform to indicate three years of service in the army or four years in the navy.
1.1A service stripe on any uniform.
2 Football One of a series of marks made along parallel lines that delineate the middle of the field, used to spot the ball after a play ends outside these lines.
3The symbol .

Definition of hash mark in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal