1 the highest point or most successful part of something:
2 the pointed end of an organ:
A chest x-ray showed an abnormality in the left lung apex.
3 abbreviation for Advance Purchase Excursion: a system of cheap travel tickets that must be bought a particular number of days before travelling:
an Apex fare
5 a train or plane ticket that is cheaper than the usual price because you buy it several days or weeks before you travel:
Even the patient should understand if told the heart is in the right side of the chest with the apex pointing to the right!
On each twig the second or third fully expanded leaf (numbered from apex to base) was selected.
The apex can be directed to the right, to the left, or to the middle.
An apex cardiogram suggested that enddiastolic pressure was not markedly elevated.
Visual leaf counts were conducted by weekly examination of the eighth main stem leaf from the plant apex.
Primary education's share of total federal government spending on education reached its apex just before the 1986 elections for the constituent assembly.
Normal mental imagery is not hallucinatory and is highly constrained by dorsolateral prefrontal structures (among other things) which are deactivated during most apex dreaming.
The leading edge of the plate was machined to a wedge angle of 30", rounded off a t the apex.