| ἀ στερητικόν | → adiabatic, agnostic, ahistorical, amoral... |
| ἄβαξ | → abacus, abaculus |
| ἄβυσσος | → abyss, abyssal, abyssocottidae, abyssopelagic |
| ἄγαλμα | → agalmatolite, agalmatophilia |
| ἀγαθή | → agate, agathodaemon |
| ἀγάπη | → agape, agapanthus, agapanthaceae |
| ἀγγαρεία | → angary, angaria, angariate |
| ἀγγεῖον | → angiosperm, angiocardiography, angiodysplasia... |
| ἄγγελος | → archangel, evangelist |
| ἄγκιστρον | → ancistrocladus, ancistrocactus, ancistrocheirus |
| ἀγκύλος | → angle |
| ἄγκυρα | → anchoring, anchorage |
| ἀγκώνας | → ancona, ancon, anconal |
| ἀγορά | → agoraphobia, agoranomos, agora |
| ἀγρός | → agrobiology, agronomics, agrology |
| ἆγχος | → αngina, anxious |
| ἀγωνία | → agonize, antagonistic, agony |
| ἀδάμας | → adamant, adamantine |
| ἀδελφός | → adelphopoiesis, adelphous |
| ἀέρας | → aerodynamics, aerofoil, aeronautics, aerobic, airplane, airship |
| ἀθλητής | → athlete, athletics |
| αἰθάλη | → aethalops, ethallobarbital |
| αἰθέρας | → ether, ethereal |
| αἴγαγρος | → aegagrus, aegagropila |
| αἰγιαλός | → aegialornis, aigialosaur, aegialornithidae |
| αἰγίς | → aegis |
| Aἴγυπτος | → egyptology, egyptologist |
| αἴλουρος | → ailurophobia, aelurodon, aeluroscalabotinae |
| Aἴολος | → Aeolic, Aeolian, Aeolotropy |
| αἴσθηση | → aesthetic, aesthetician, aestheticism, aesthete, aesthetics |
| αἰσχύνω | → aeschynanthus, aeschynite |
| αἰτία | → etiology, aetiology |
| αἰχμή | → aechmophorus, aechmea |
| αἰώνας | → eon |
| Ἀκαδημία | → academy, academic |
| ἄκανθος | → acantharea, acanthite, acanthocephala, acanthocercus... |
| ἀκάρι | → acarid, acariasis, acarology |
| ἀκμή | → acne, acnestis |
| ἀκόλουθος | → anacoluthon, acolyte |
| ἀκόνη | → aconitum, paragon |
| ἀκούω | → acoustic guitar, acoustic nerve, acoustic theory, acoustics |
| ἄκρον | → acrobat, acrocephalus, acrochordidae, acrochordon, acromantula, acronym, acrotomophilia |
| ἀκτίνα | → actinium, actinobacteria, actinodine, actinolite... |
| ἂκτωρ | → actor |
| ἀλάβαστρος | → alabaster |
| ἀλλαντοειδής | → allantois, allantoin |
| Ἀλέξανδρος | → Alexander, alexipharmic, alexithymia, alexiteric |
| ἀλεποῦ | → alopecia |
| ἀλεύρι | → aleurone, aleuromancy |
| ἄλγος | → -algia, arthralgia, cardialgia, cephalalgia... |
| ἀλοιφή | → aliphatic, Aliphatic hydrocarbon |
| ἄλκιμος | → analcite |
| ἀλληγορία | → allegory |
| ἄλληλος | → allelomorph, parallelogram |
| ἄλλος | → allochthon, allodium, allodontidae, allogenes... |
| ἀλλότροπος | → allotropy, allotropes, allotropism, |
| ἄλυσσος | → alyssum, Alyssa |
| ἄλφα | → alphabet, alphabetize, alphagram, alphanumeric... |
| Ἀμαζών | → Amazon, Amazonomachy, Amazonite, Amazonia |
| Ἀμάλθεια | → Amalthea |
| ἀμάρανθος | → amaranth, amaranthaceae, amaranthoideae |
| Ἀμαρυλλίς | → amaryllis, amaryllidaceae |
| ἀμαύρωσις | → amaurosis, amaurophilia, amaurobiidae |
| ἀμβλύς | → amblygonite, amblyopia, amblypoda |
| ἄμβροτος | → ambrosia, ambrotype |
| ἄμβυξ | → alembic, alembication, alembicated |
| ἄμβων | → ambo |
| ἄμμος | → ammoperdix, ammophila, ammotrechidae |
| ἀμμωνία | → ammonia, ammoniacal |
| ἀμνός | → amnion, amniotic, amniocentesis, amnioscope, |
| ἀμοιβή | → amoeba, amoebic |
| ἄμυλον | → amylin, amyloid, amylose, amylopectin, amylase, amyls, amylophagia, amyl |
| ἀμυγδαλή | → almond |
| ἀμφί | → amphipoda, amphioxus, amphiglossus |
| ἀμφορέας | → amphora, ampulla |
| ἀμφότερος | → amphoteric |
| ἀνά | → anabolism, anachronism, anaplasia |
| ἄναξ | → anax |
| Ἀνδρομέδα | → Andromeda, Andromeda polifolia |
| ἄνεμος | → anemometer, anemoscopy, anemoscope, anemophilous |
| ἀνεμώνη | → anemone, sea-anemone |
| ἀνεύρισμα | → aneurysm, microaneurysm |
| ἄνδρας | → androcentrism, androgen, android, andrologist, andrology, androstephium, androsterone |
| ἄνθος | → anthology, anthophyta, anthostema, anthogonium... |
| ἄνθρακας | → anthrax, anthracotherium, anthracosauria, anthracosis |
| ἄνθρωπος | → anthropology, anthropomorphism, anthropopathy... |
| ἀντί | → antibiotic, anticyclone, antidiabetic, antihero... |
| ἄντρον | → antrum |
| ἄξιος | → axiological, axiology, axiology, axiom... |
| ἄξων | → axis, axoneme, axoplasm, axisymmetric |
| ἀόριστος | → aoristic, aorist |
| ἀορτή | → aortic, aorta |
| ἀπάτη | → apatite, apatosaurus |
| ἀπό | → apology, apostrophe, apocrypha |
| ἀράχνη | → arachnid |
| ἄργιλλος | → argillite, argillaceous |
| Ἄρης | → areo-, areocentric, areology, areography |
| ἀρκῶ | → arc, arcade |
| ἀρθρῖτις | → arthritis, osteoarthritis |
| ἄρθρον | → arthropod, arthroscopy, arthropathy |
| ἀριθμός | → arithmetic, logarithm |
| ἄριστος | → aristocracy |
| ἄρκτος | → arctic |
| ἀρκτοῦρος | → arcturus, arcturis, arcturian |
| ἄρτιος | → artiodactyl |
| ἀρχαῖος | → archaeology, archetype |
| ἀρχή | → archbishop, anarchy, archidiptera, archigram, archipelago... |
| ἀρχιτέκτων | → architecture, architect |
| ἄρχων | → archon, archosaur, archostemata |
| ἄρωμα | → aroma, aromatic compounds |
| ἀσθένεια | → asthenia, asthenopia |
| ἄσθμα | → asthmatic |
| Ἀσία | → Asia Minor, Asian, Asianisation, asiaphile |
| ἀσπάραγος | → asparagine acid, aspartame, aspartate |
| ἀσπίδα | → asp |
| ἀστέρι | → asteroid, asterisk |
| ἀστράγαλος | → astragalus, astragal |
| ἄστρον | → astronomy, astrology, astrophysics, astronaut, astrolabe... |
| ἄσυλον | → asylum |
| ἀσφυξία | → asphyxiant |
| ἀτμόσφαιρα | → atmosphere, atmospheric |
| Ἄτλας | → atlas, Atlantic |
| ἄτομο | → atomic, atomizer |
| Ἀττική | → attic, atticism |
| αὐθεντικός | → authentication, authentic |
| αὐστηρός | → austerity |
| αὐξάνω | → auxin, auxesis, |
| αὐτός | → autonomy, automatic |
| Ἀφροδίτη | → aphrodisiac, aphrodisia, |
| ἀψίδα | → apse, apsis, apsidal, hassium, Diapsida |
| ἐγκυκλοπαίδεια | → encyclopedia |
| εἰκόνα | → icon, iconicity, iconoclast |
| ἔτυμον | → etymology |
| εὖ | → eulogy, euphoria |
| ἠώς | → eocene |
| ἴδιος | → idiolect, idiom, idiot, individual |
| ἰχθύς | → ikhthus, ichthyology |
| οἶνος | → oenomel |
| ὀλίγος | → oligarchy |
| ὀξύς | → oxygen |
| ὄργανον | → organ, organism |
| ὀρθός | → orthography, orthogonal |
| ὠόν | → oocyte, oology |