philo-, phil-, -phile, -philia, -philic, -philous, -phily, -philiac, -philist, -philism
(Greek: love, loving, friendly to, fondness for, attraction to; strong tendency toward, affinity for)
These are just a few of the meanings set up for the etymological meanings of philo- which comes to us from Greek.
In biology, there are many words that use philo-, phil- to mean "thriving in such and such a place or situation; or exhibiting a tendency for a specified condition" for its existence.
Other meanings include: "strongly attracted to; such as, an organism that loves or is strongly attracted to something which is specified".
In psychology and psychiatry, -phile, -philia, etc. use this element as a word termination indicating an abnormal craving or attraction to or an affinity for an object as shown by the word stems to which they are affixed.
2. Thriving in intense light.
2. Conveying a strong attraction for light.