A Stricture

1. (usually in the plural) A rule restricting behaviour or action. Synonyms: A Constraint, A Restriction, A Restraint
2. A general state of restrictiveness on behavior, action, or ideology.
3. A sternly critical remark or review.
4. (medicine) Abnormal narrowing of a canal or duct in the body. Coordinate terms: stenosis, atresia, impatency, imperforation
5. (obsolete) Strictness.
6. (obsolete) A stroke; a glance; a touch.
7. (linguistics) The degree of contact, in consonants.