avocados are berries

to this explanation i will add the following fact, which may or may not be remembered wrong from botany or maybe ecology: cherries are "drupes."

wikipedia sez:


Simple fruit

Simple fruits can be either dry or fleshy, and result from the ripening of a simple or compound ovary with only one pistil. Dry fruits may be either dehiscent (opening to discharge seeds), or indehiscent (not opening to discharge seeds).[13] Types of dry, simple fruits, with examples of each, are:
achene – (dandelion seeds, strawberry seeds)
capsule – (Brazil nut)
caryopsis – (wheat)
fibrous drupe – (coconut, walnut)
follicle – (milkweed, magnolia)
legume – (pea, bean, peanut)
loment
nut – (hazelnut, beech, oak acorn)
samara – (elm, ash, maple key)
schizocarp – (carrot seed)
silique – (radish seed)
silicle – (shepherd's purse)
utricle – (beet)

Fruits in which part or all of the pericarp (fruit wall) is fleshy at maturity are simple fleshy fruits. Types of fleshy, simple fruits (with examples) are:
berry – (redcurrant, gooseberry, tomato, avocado)
stone fruit or drupe (plum, cherry, peach, apricot, olive)
false berry – Epigynous accessory fruits (banana, cranberry, strawberry (edible part).)
pome – accessory fruits (apple, pear, rosehip, saskatoon berry)
Aggregate fruit


Aggregate fruit

An aggregate fruit, or etaerio, develops from a flower with numerous simple pistils.[14] An example is the raspberry, whose simple fruits are termed drupelets because each is like a small drupe attached to the receptacle. In some bramble fruits (such as blackberry) the receptacle is elongated and part of the ripe fruit, making the blackberry an aggregate-accessory fruit.[15] The strawberry is also an aggregate-accessory fruit, only one in which the seeds are contained in achenes.[16] In all these examples, the fruit develops from a single flower with numerous pistils.
Some kinds of aggregate fruits are called berries, yet in the botanical sense they are not.


Multiple fruit

A multiple fruit is one formed from a cluster of flowers (called an inflorescence). Each flower produces a fruit, but these mature into a single mass.[17] Examples are the pineapple, edible fig, mulberry, osage-orange, and breadfruit.

In some plants, such as this noni, flowers are produced regularly along the stem and it is possible to see together examples of flowering, fruit development, and fruit ripening.

In the photograph on the right, stages of flowering and fruit development in the noni or Indian mulberry (Morinda citrifolia) can be observed on a single branch. First an inflorescence of white flowers called a head is produced. After fertilization, each flower develops into a drupe, and as the drupes expand, they become connate (merge) into a multiple fleshy fruit called a syncarpet.[18]
There are also many dry multiple fruits, e.g.
Tuliptree, multiple of samaras.
Sweet gum, multiple of capsules.
Sycamore and teasel, multiple of achenes.
Magnolia, multiple of follicles.



To summarize common types of fruit (examples follow in the table below):
Berry – simple fruit and seeds created from a single ovary
Pepo – Berries where the skin is hardened, like cucurbits
Hesperidium – Berries with a rind, like most citrus fruit
Epigynous berries(false berries) – Epigynous fruit made from a part of the plant other than a single ovary
Compound fruit, which includes:
Aggregate fruit – multiple fruits with seeds from different ovaries of a single flower
Multiple fruit – fruits of separate flowers, packed closely together
Other accessory fruit – where the edible part is not generated by the ovary