# trigono-, trigon- +

#### (Greek: triangular; three angles)

trigon

1. A figure having three angles and three sides; a triangle.

2. A set of three signs of the zodiac, distant 120 degrees from each other, as if at the angles of an equilateral triangle.

2. A set of three signs of the zodiac, distant 120 degrees from each other, as if at the angles of an equilateral triangle.

trigonal

Triangular; related to a

*trigonum*.
trigone

1. Any triangular area.

2. The first three dominant cusps (

2. The first three dominant cusps (

*protocone, paracone,*and*metacone*), taken collectively, of an upper molar tooth.
trigonectomy

The surgical removal of the

*trigonum vesicae*, the base of the urinary bladder.The *trigonum vesicae* is a smooth triangular area on the interior of the base of the urinary bladder where the mucous membrane is firmly attached to the underlying muscle layer.

trigoneutic

In entomology, having three broods a year.

trigonid

The first three dominant cusps, taken collectively, of a lower molar tooth.

trigonitis

1. Inflammation of the urinary bladder.

2. Inflammation localized at the bladder trigone (trigonum vesicae), producing an edematous (swollen with an excessive accumulation of fluid) and sometimes bulbous (bulb) appearance of the mucosa of the trigone; also known as

2. Inflammation localized at the bladder trigone (trigonum vesicae), producing an edematous (swollen with an excessive accumulation of fluid) and sometimes bulbous (bulb) appearance of the mucosa of the trigone; also known as

*collitis*.
trigonocephalia, trigonocephaly

A developmentally abnormal head in which the skull acquires a more or less triangular configuration owing to premature synostosis of cranial bones. The cerebral hemispheres tend to be compressed.

trigonocephalic

Displaying the characteristics of trigonocephaly.

trigonometry

That branch of mathematics that deals with the measurement of the sides and angles of triangles, particularly with certain functions of their angles or of angles in general (the sine, cosine, tangent, cotangent, secant, and cosecant), and hence with these functions as applied to abstract quantities; thus including the theory of triangles, of angles, and of (elementary) singly periodic functions.

trigonotome

A device for surgical incision of the bladder trigone.

trigonum (s), trigona (pl)

1. Any triangular area.

2. Etymology: Greek > Latin

2. Etymology: Greek > Latin

*trigonon*, "a triangle".
Cross references of word families that are related, partially or totally, to: **"three, third":**
**terce-**;
**terti-**;
**tri-, tre**;
**trito-**.

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