Tri- is a combining form used like a prefix meaning “three.” Tri- is often used in a great variety of both everyday and technical terms. Tri- ultimately comes from both Greek treîs, tría and Latin trēs, tria, all of which mean “three.”

Table of number prefixes in English

Number	Latin prefixes	Greek prefixes
	Cardinal	Cardinal
3	tri- e.g. trireme	tri- e.g. triathlon, Tripolis
4	quadri-, quadru-	tetra-, tessara-
5	quinque-	penta-

Prefix: Tri

A	B
tricycle	a vehicle with three wheels
triceratops	a dinosaur with three horns
triathlon	a race with three activities -swimming, biking, running
triangle	a shape with three angles

word-forming element meaning “three, having three, once every three,” from Latin tres (neuter tria) or Greek treis, trias “three” (see three).

Modern Triathlon history dates back to the early 1970s and originated with the San Diego Track Club. The triathlon was designed to be an alternative to hard track training. The first triathlon event was held on September 25, 1974. Don Shanahan and Jack Johnstone are pioneers in the history of the triathlon.

Hydra (/ˈhaɪdrə/ HY-drə) is a genus of small, fresh-water organisms of the phylum Cnidaria and class Hydrozoa. They are native to the temperate and tropical regions. Biologists are especially interested in Hydra because of their regenerative ability – they do not appear to die of old age, or to age at all.

Hydra, genus of invertebrate freshwater animals of the class Hydrozoa (phylum Cnidaria). The body of such an organism consists of a thin, usually translucent tube that measures up to about 30 millimetres (1.2 inches) long but is capable of great contraction.

The Latin root word dict and its variant dic both mean ‘say. ‘ Some common English vocabulary words that come from this word root include dictionary, contradict, and dedicate.

-fac- comes from Latin, where it has the meaning “do; make. ” This meaning is found in such words as: benefactor, de facto, facsimile, fact, faction, faculty, manufacture.

Quick Summary. The origin of the prefix anti- and its variant ant- is an ancient Greek word which meant “against” or “opposite.” These prefixes appear in numerous English vocabulary words, such as antifreeze, antidote, antonym, and antacid.

time

a combining form meaning “power,” used in the formation of compound words: dynamotor.

1 : the science that deals with measuring time by regular divisions and that assigns to events their proper dates. 2 : a chronological table, list, or account a chronology of the author’s works.

Tele

tele

In linguistics, a morph is a word segment that represents one morpheme (the smallest unit of language that has meaning) in sound or writing. For example, the word infamous is made up of three morphs—in-, fam(e), -eous—each of which represents one morpheme.

The Greek root word bio means ‘life. ‘ Some common English vocabulary words that come from this root word include biological, biography, and amphibian.

-logy is a suffix in the English language, used with words originally adapted from Ancient Greek ending in -λογία (-logia). The suffix has the sense of “the character or deportment of one who speaks or treats of [a certain subject]”, or more succinctly, “the study of [a certain subject]”.

word-forming element meaning “a speaking, discourse, treatise, doctrine, theory, science,” from Greek -logia (often via French -logie or Medieval Latin -logia), from -log-, combining form of legein “to speak, tell;” thus, “the character or deportment of one who speaks or treats of (a certain subject);” from PIE root * …

The Greek root word log means ‘word,’ and its variant suffix -logy means ‘study (of). ‘ Some common English words that use this root include biology, mythology, catalog, and prologue.

-ology Word	Description
anthology	A published collection of poems or other pieces of writing.
anthropobiology	The study of the biologic relationships of humans as a species.
anthropology	The holistic scientific and social study of humanity, mainly using ethnography as its method.

ophthalmootorhinolaryngology

Terms in this set (14)

• Oceanology. The study of oceans.
• genetics. The study of heredity and DNA.
• Physics. The study of motion and force.
• zoology. The study of animals.
• Astronomy. The study of stars.
• Marine biology. The study of plants and animals that live in the ocean.
• botany. The study of plants.
• geology.

Derived from the Greek suffix -logia, the suffix -ology in English means “the science of or the study of.”

two organisms that are related to hydra include jellyfish and sea anemones.

No, their stinging cells are too weak to affect humans. If you try to touch them, they quickly retract their tentacles and ball up to avoid predation from larger animals.

Although hydra are fairly simple animals, the stinging cells which they use to catch their prey are quite complex structures. This toxin is too weak to have any effect on humans which happen to touch the tentacles, unlike the toxins from the stinging cells of jellyfish, which can cause painful stings to humans.

Answer Expert Verified Fish reproductive organs include testes and ovaries. Nearly all fish reproduce by sexual reproduction by the fusion of sperms and egg. Whereas, hydras generally reproduce asexually. They do this through budding.

Measuring just millimeters, the hydra is made up of a tube-like body, half-a-dozen tentacles on top and a sticky foot to hold it in place. Typically, hydras are a brown, green or off-white in color – although you might need a magnifying glass to tell. These things are small!

Similarities of fish and hydra can be seen in how the two organisms sexually reproduce, they release eggs in the water and these eggs will find the sperm, which was placed at a certain spot, and then fertilization would occur.

Although a small pest, measuring just an inch or less, Hydras are capable of killing and eating most fish fry and even small adult fish. Hydra can also slowly inch along a substrate by attaching and releasing their tentacles and foot alternatively.

Hydra can be found in large variety of freshwater habitats. They mostly occur in ponds, lakes, and slow flowing parts of streams and rivers. Hydra are sessile and live attached to aquatic vegetation, submerged wood, or stones.

One source mentioned that assassin snails ate hydra. I have long fed microworms to the guppies in the tank where the assassins breed and, before adding the snails, I did have an opportunistic and persistent population of hydra on the glass, thriving on the microworms.

Some fish, like Guppies and gouramis, have been known to eat Hydra. Gouramis or Guppies can very easily gobble down fry of other fish also. Hobbyists also use chemicals like fenbendazole and flubendazole to eradicate Hydra. These chemicals are known to be fish-safe, but they kill snails.

The physique of a hydra seems standard at first. Its body is that of a dragon: covered in impenetrable scales with four legs and a large tail. When someone cuts off the head of the hydra, the head will grow back into two heads. This means the hydra could, theoretically, grow an infinite amount of heads.