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(Chem.) A prefix or combining form (also used adjectively) indicating the presence of three methyl groups.

ith a characteristic herringlike odor. It is regarded as a substituted ammonia containing three methyl groups.

A substance which crystallizes in three distinct forms, or which has three distinct physical states; also, any one of these distinct forms. See Trimorphism, 1.

The property of crystallizing in three forms fundamentally distinct, as is the case with titanium dioxide, which crystallizes in the forms of rutile, octahedrite, and brookite. See Pleomorphism.

A lamellibranch which has three muscular scars on each valve.

Threefold. "Trinal unity." Milton. In their trinal triplicities on high. Spenser.

Threefold; triple; as, trine dimensions, or length, breadth, and thickness.

Having three ribs or nerves extending unbranched from the base to the apex; -- said of a leaf. Gray.

The doctrine of the Trinity; the doctrine that there are three distinct persons in the Godhead.

Gun cotton; -- so called because regarded as containing three nitro groups.

The union of three persons (the Father, the Son, and the Holy Ghost) in one Godhead, so that all the three are one God as to substance, but three persons as to individuality.

A three-cornered sail formerly carried on a ship's foremast, probably on a lateen yard. Sailing always with the sheets of mainsail and trinket warily in our hands. Hakluyt.

Lasting during three nights; comprising three nights.

Having three knots or nodes; having three points from which a leaf may shoot; as, a trinodal stem.

A quantity consisting of three terms, connected by the sign + or -; as, x + y + z, or ax + 2b - c2.

A genus of Lower Silurian trilobites in which the glabella and cheeks form three rounded elevations on the head.

Three, considered collectively; three in company or acting together; a set of three; three united. The trio were well accustomed to act together, and were linked to each other by ties of mutual interest. Dickens.

Of the value of three oboli; hence, mean; worthless. [Obs.] It may pass current . . . for a triobolar ballad. Cheyne.

An aspect of two planets with regard to the earth when they are three octants, or three eighths of a circle, that is, 135 degrees, distant from each other. Hutton.

Having three sorts of flowers on the same or on different plants, some of the flowers being staminate, others pistillate, and others both staminate and pistillate; belonging to the order Trioecia.