Brad Gibson wrote
I was wondering if anyone knew the name of a certain kind of
nut. Its tree grows in tropical areas, and can be about 60 ft high and about
as wide (including branches) as it is tall. It has big leaves that have
rounded ends.

The nut with its shell is about 3-4 in. long and about
1.5 in. thick, and usually has green or red skin on the outside. It is
shaped like a lemon if you look at it in one way and like a flying saucer
if you turn it around a little bit, and has a ridge around it. The actual
nut, which is edible (and very good-tasting), looks like an almond, but is
about twice as long.

Brad

MMMavocado schreef
3-4" long with the possibility of a red shell, and a nut that looks like
an almond but longer, does not sound at all like Macadamia to me. I like
the
Terminalia suggestion of a few days ago.

+ + +
Anyway it was a lot closer, although apparently not an exact match:
"Indian or tropical almond: Terminalia catappa, Combretaceae
[...]
Description
A deciduous or sometimes semi-evergreen tree to 15(-25) m tall with trunk to
1.5 m in diameter, often buttressed. Leaves alternate, obovate, 15-36 cm
long, 8-24 cm wide, subcordate at the base and usually with 2 glands,
petiole short; leaves turning red before falling and quickly replaced.
Inflorescence spicate, male flowers towards the apex with hermaphrodite
flowers below; flowers greenish, apetalous.

Fruit a somewhat compressed-ellipsoid drupe, 4-7 cm long, 2.5-3.8 cm wide,
prominently keeled along the margins; epicarp thin, green turning yellow
with a reddish blush; mesocarp fleshy, 3-6 mm thick, adherent to the fibrous
husk of the hard-shelled stone containing the spindle-shaped seed; seed 3-4
cm long, 3-5 mm thick, testa very thin, brown, enveloping the coiled
cotyledons or kernel (Exell, 1954; Rosengarten, 1984; Morton, 1985). "

It is hard to tell from the description of OP. Of course there is a fair
number of other Terminalia species. Also, if the number of species that is
now reduced to Terminalia catappa is taken into account, there should be a
considerable variation in this one species.
PvR