(Med.), a form of gangrene occuring particularly in old people, and caused usually by insufficient blood supply due to degeneration of the walls of the smaller arteries.

(Se*nil"i*ty) n. [Cf. F. sénilité.] The quality or state of being senile; old age.

(Sen"ior) a. [L. senior, compar. of senex, gen. senis, old. See Sir.]

1. More advanced than another in age; prior in age; elder; hence, more advanced in dignity, rank, or office; superior; as, senior member; senior counsel.

2. Belonging to the final year of the regular course in American colleges, or in professional schools.

(Sen"ior), n.

1. A person who is older than another; one more advanced in life.

2. One older in office, or whose entrance upon office was anterior to that of another; one prior in grade.

3. An aged person; an older. Dryden.

Each village senior paused to scan,
And speak the lovely caravan.

4. One in the fourth or final year of his collegiate course at an American college; — originally called senior sophister; also, one in the last year of the course at a professional schools or at a seminary.

(Sen*ior"i*ty) n. The quality or state of being senior.

(Sen"ior*ize) v. i. To exercise authority; to rule; to lord it. [R.] Fairfax.

(Sen"ior*y) n. Seniority. [Obs.] Shak.

(Sen"na) n. [Cf. It. & Sp. sena, Pg. sene, F. séné; all fr. Ar. sana.]

1. (Med.) The leaves of several leguminous plants of the genus Cassia. (C. acutifolia, C. angustifolia, etc.). They constitute a valuable but nauseous cathartic medicine.

2. (Bot.) The plants themselves, native to the East, but now cultivated largely in the south of Europe and in the West Indies.

Bladder senna. (Bot.) See under Bladder.Wild senna(Bot.), the Cassia Marilandica, growing in the United States, the leaves of which are used medicinally, like those of the officinal senna.

Senile gangrene

  By PanEris using Melati.

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