peri- +

1. The horny or chitinous outer case or covering protecting the soft parts of hydrozoans.
2. The outer, hardened integument which covers most hydroids.

A reference to the horny or chitinous outer case or covering protecting the soft parts of hydrozoans.

1. An optical instrument that provides a view of an otherwise obstructed field.
2. A long tubular optical instrument; for example, on a submarine, that uses lenses, prisms, and mirrors to allow a viewer to see objects not in a direct line of sight.
3. An optical instrument for viewing objects that are above the level of direct sight or in an otherwise obstructed field of vision, consisting essentially of a tube with an arrangement of prisms or mirrors and, usually, lenses; used especially in submarines.

1. A reference to certain lenses in special microscopes, cameras, etc.; giving distinct vision obliquely, or all around, as well as, or instead of, in a direct line.
2. Periscopic spectacles, spectacles having concavo-convex or the convexo-concave lenses with a considerable curvature corresponding to that of the eye, to increase the distinctness of objects viewed obliquely.
3. A reference to periscopes or their uses.

A reference to certain lenses in special microscopes, cameras, etc. that give distinct vision obliquely, or all around, as well as, or instead of, in a direct line.

Periapsis in orbit around the moon.

A periapsis is the point of an orbit closest to the body being orbited.

1. To die or to be destroyed through violence, privation, etc.; such as, to perish in an earthquake.
2. To pass away or disappear.
3. To suffer destruction or ruin.
4. To suffer spiritual death.
5. "Perish the thought", may it never happen; used facetiously or as an afterthought of foreboding.

Surrounding the outer walls of the body, not the inner organs.

Nutritive tissue from a plant nucleus that surrounds the seed embryo.

Inflammation of the tissues around a vertebra.

1. Having an uneven number of toes or digits on each foot.
2. Any mammal of the order Perissodactyla, comprising the odd-toed hoofed quadrupeds and including the tapirs, rhinoceroses, and horses.

An order of nonruminant ungulate mammals; such as, the horse (with one toe), the tapir, or the rhinoceros (with three toes), that usually have an odd number of toes, molar teeth with transverse ridges on the grinding surface, and posterior premolars resembling true molars.

The middle digit bears the weight of the body. These herbivorous mammals typically have feet encased in a protective horny hoof, lips adapted for plucking, strong cropping incisor teeth, and molars and premolars adapted for chewing.

The stomach is simple and bacterial digestion of cellulose occurs in the cecum, a blind pouch at the junction of the ileum and the colon.

Such herbivores rely on the activity of millions of symbiotic bacteria living in the cecum. These produce enzymes capable of digesting cellulose and releasing simple soluble substances that can be absorbed into the bloodstream.

The condition of being perissodactyl or having an uneven number of toes or digits on each foot

1. Having an odd number of digits on a hand or foot.
2. A reference to the Perissodactyla (a division of ungulate, or hoofed, mammals, including those that have an odd number of toes, as the horse, tapir, and rhinoceros).

1. Redundance or superfluity of speech.
2. The use of more words than are necessary; pleonasm.