ad-

(From Latin: "to, toward, a direction toward, an addition to, near, at"; and changes to: "ac-, af-, ag-, al-, an-, ap-, aq-, ar-, as-, at-" and ad- is also combined with certain words that begin with the letters c, f, g, l, n, p, q, r, s, and t.)

The Latin element ad carries the idea of "in the direction of" and combines with many Latin words and roots to make common English words.

advective
A reference to or caused by advection (the transfer of heat, cold, or other atmospheric properties by the horizontal motion of a mass of air).
adventitia (s) (noun)
A membrane that covers an organ but is not part of that organ: "Adventitia is primarily made up of connective tissue."

"The layer known as adventitia is a pliable sheet of tissue that covers, lines, or connects the organs or cells of animals or plants."

adventitial (adjective)
adventitious (adjective)
1. Of the nature of an addition from without; extrinsically added, not essentially inherent; supervenient, accidental, casual.
2. Appearing casually, or out of the normal or usual place; especially, in botany of roots, shoots, buds, etc. produced in unusual parts of the plant.
3. Not in the usual order or place.
4. Not natural or hereditary; such as, roots that form on stems, a growth of hair where it usually does not grow, or the growth of a plant in a foreign habitat.
adventitious bud
A leaf bud that occurs in an unusual position; such as, on leaves or roots.
adventure
1. That which comes to us, or happens without design; chance, fortune, luck.
2. A chance occurrence, an event or issue, an accident.
3. A hazardous or perilous enterprise or performance; a daring feat; hence, a prodigy, a marvel.
4. Any novel or unexpected event in which one shares; an exciting or remarkable incident befalling any one.
5. The encountering of risks or participation in novel and exciting events; adventurous activity, enterprise.
adverb
A word used to modify (describe) or limit (make specific), the meaning of a verb, an adjective, or another adverb. Most adverbs are formed by adding -ly to adjectives; however, adjectives ending in ic add ally: basic, basically. Others, such as well, "far, low, hard, early", and "fast"; have the same form as adjectives.

In summary: adverbs tell manner (how), time (when), place (where), degree (how much), and sometimes cause (why).

Adverbs of manner: "politely, carefully, not, equally, tenderly".

Adverbs of time: "now, then soon, later, early, often".

Adverbs of place: "here, there, near, forward, far."

Adverbs of degree: "very, so, much, too, extremely, rather."

Adverbs of cause: "why, therefore, hence".

adversary (s) (noun), adversaries (pl)
1. A person who, or that which, takes up a position of antagonism, or acts in a hostile manner; an opponent, antagonist; an enemy, a foe: The governor's political adversaries tried to keep him from winning a second term in office.
2. Etymology: from Anglo-French adverser, from Old French adversier, from Latin adversarius, "opponent, rival"; literally, "turned toward one", from adversus, "turned against".
A foe or a person who opposes another person.
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An opponent, an enemy, or a foe.
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adverse (ad VURS, AD vurs") (adjective), more adverse, most adverse
Relating to being opposed to or hostile to someone or something; unfavorable and negative: Adverse winds prevented the plane from arriving on time.

Adverse winds usually reduce the speed of sailing vessels.

When striving to achieve a worthy objective, everyone should try never to be discouraged by adverse criticism.

High interest rates are adverse to increasing the sales of houses.

Conflicting with and contrary to one's interests; unfortunate.
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adverse hydro (adjective), more adverse hydro, most adverse hydro
A description of water situations that are unfavorable to the generation of water power: Adverse hydro conditions; such as, low rainfall or snowfall, and the lack of runoff from mountains or hills, limits the production of hydroelectric power.
adversed
1. Created as unfavorable, undesirable, or harmful results.
2. Having acted with or characterized by opposition or antagonism; for example, adversed publicity.
3. Momentum that existed in a direction away from that which was desired.
4. In botany, a leaf or flower that faced the main stem.
5. Etymology: from Old French avers (Modern French adverse); from Latin adversus, "turned against"; therefore, "hostile"; past participle of advertere, from ad-, "to" + vertere, "to turn".
advertise
1. To publicize the qualities of a product, service, business, or event in order to encourage people to buy or to use it.
2. To publicize something; such as, a job opening or an item for sale.
advice (s) (noun), advices (pl)
1. An opinion, suggestion, or recommendation offered as a guide to action, conduct, etc.: William and Sharon decided to act on their father's advice and to get married.
2. An opinion about what could or should be done about a situation or problem; to give counsel: Since this is a legal matter, Mike was urged to get a lawyer’s advice before he got involved in the business deal.
4. Formal or official information about something; intelligence, news report: Advice from abroad indicates that war is about to begin.
5. Etymology: from Latin ad-, "to" + visum, past participle of videre, "to see".

Advice is what you get from your parents when you are growing up, and from your children when you are growing old.

—Evan Esar

It’s a pleasure to give advice, humiliating to need it, normal to ignore it.

—E.C. McKenzie
advise (ad VIGHZ) (verb), advises; advised; advising
1. To offer an opinion or a course of action; to counsel; to notify, to recommend: Sidney advised Jon to reconsider his decision to sell his car.
2. To inform, tell, notify, make known, communicate: Mary and Richard have been advised that the roads are too icy for the trip that they were planning to take.
3. Giving an opinion or suggestion to someone about what should be done: Shirley advises the President on foreign affairs.

Howard's lawyer is advising him about whether he should buy the house under such financial conditions.

4. Etymology: from Old French avis, "opinion"; which came from Old French ce m'est à vis, "it seems to me"; or from Vulgar (common) Latin mi est visum, "in my view"; and originally from Latin ad-, "to" + visum; past participle of videre, "to see".
advisedly (adverb), more advisedly, most advisedly
Relating to doing something with careful consideration and thoughtfulness: Jeremiah was advisedly cautioned by his therapist to take time off from work so he can recover from his back injury.