an active volcano in the S Philippines, on S Mindanao: highest peak in the Philippines. 9690 feet (2954 meters).
a prefix occurring originally in loanwords from Greek, where it was joined to verbs, deverbal forms, and other parts of speech. Among its functions in Greek, apo-, has the spatial sense “away, off, apart” (apogee; apocope; apostasy; apostrophe); it occurs with deverbals that denote a response or defense (apodosis; apology) and is found on verbs having perfective force relative to a corresponding simple verb (apoplexy; aposiopesis). In modern scientific coinages in English and other languages, apo-, marks things that are detached, separate, or derivative (apocarpous; apoenzyme).
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Historical Examples

On arrival they had checked in at the Apo View Hotel and had lost no time in finding local constabulary headquarters.
The Pirates of Shan Harold Leland Goodwin

Their home is at the foot of the volcano of Apo (Davao, in Mindanao).
Philippine Progress Prior to 1898 Various

Apo yad adrim puruhta dardar vir bhuvat saram prvyaṁ te; Ṛigv.
Zoological Mythology (Volume II) Angelo de Gubernatis

All kin of the same generation as his grandparents, great-grandparents, etc., are Apo (grandparents).
Ifugao Law R. F. Burton

The dark crept swiftly up the slopes as if envious of the ruby crown set on Apo’s forehead by the abdicating sun.
Terry Charles Goff Thomson

Nearly every evening, near sundown, I see a pair of wild pigeons homing toward the crest of Apo.
Terry Charles Goff Thomson

Apo is the name given to him who governs, and that name is applied by these Indians to him who has any authority in the village.
The Philippine Islands, 1493-1898 Various

The ruling spirit or spirits is “Apo sen diot” (“Apo” meaning lord or sir and “diot” being a corruption of Dios).
The Negrito and Allied Types in the Philippines and The Ilongot or Ibilao of Luzon David P. Barrows

the highest mountain in the Philippines, on SE Mindanao: active volcano with three peaks. Height: 2954 m (9690 ft)
away from; off: apogee
indicating separation of: apocarpous
indicating a lack or absence of: apogamy
indicating derivation from or relationship to: apomorphine

before vowels ap-, word-forming element meaning “from, away from, separate, free from,” from Greek apo “from, away from; after; in descent from,” in compounds, “from, asunder, away, off; finishing, completing; ceasing from; back again,” from PIE root *apo- “off, away” (cf. Sanskrit apa “away from,” Avestan apa “away from,” Latin ab “away from, from,” Gothic af, Old English of “away from”).

apo- or ap-

Away from; off: aponeurosis.

Separate: apocrine.

Without; lacking; not: apoferritin.

Related to; derived from: apomorphine.

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