photoperiod

noun 0.868

photomorphogenesis

noun 0.673

phototropism

noun 0.653

chronobiology

noun 0.628

photobiology

noun 0.623

photoreception

noun 0.602

phenology

noun 0.592

photosensitivity

noun 0.588

circadian rhythm

noun 0.585

photoinhibition

noun 0.579

phototaxis

noun 0.578

photosensitization

noun 0.578

photochromism

noun 0.576

photochemistry

noun 0.569

daylength

noun 0.557

photodermatitis

noun 0.555

photoisomerization

noun 0.554

phytochrome

noun 0.553

heliotropism

noun 0.552

light therapy

noun 0.552

photoprotection

noun 0.551

photosystem

noun 0.549

photophase

noun 0.549

phototransduction

noun 0.542

chronotherapy

noun 0.537

photoreactivity

noun 0.537

photoaging

noun 0.536

seasonality

noun 0.534

seasonal affective disorder

noun 0.533

photopigment

noun 0.533

photosynthesis

noun 0.531

geotropism

noun 0.529

photophobia

noun 0.528

phototherapy

noun 0.528

photodimerization

noun 0.527

diurnal

noun 0.526

photorespiration

noun 0.525

photoallergy

noun 0.525

photochemical

noun 0.521

photoreaction

noun 0.520

photoresponse

noun 0.519

phytohormone

noun 0.517

seasonal depression

noun 0.514

tropism

noun 0.514

time of day

noun 0.508

photosensor

noun 0.508

photolysis

noun 0.506

photometry

noun 0.506

phototroph

noun 0.505

phytopathology

noun 0.504

biophotolysis

noun 0.504

photoactivation

noun 0.504

phototype

noun 0.503

dendrochronology

noun 0.503

photodiode

noun 0.502

periodicity

noun 0.501

photochemical reaction

noun 0.500

photoirradiation

noun 0.500