1 Freezing weather and ice are examples of the rigors of winter. 2  Difficult and challenging academic courses are an example of academic rigor. 3  harshness or severity; specif., 4  strictness or inflexibility: the rigor of martial law.  extreme hardship or difficulty: the rigors of life.
-logy, -logia, a suffix meaning a science or study of: mammalogy, metabology, neonatology. Suffix meaning 1. The study of the subject noted in the body of the word, or a treatise on the same; the English equivalent is-logy, or, with a connecting vowel, -ology [G. logos, discourse, treatise].2.logia. Suffix meaning 1. The study of the subject noted in the body of the word, or a treatise on the same; the English equivalent is-logy, or, with a connecting vowel, -ology [G. logos, discourse, treatise]. 2. Collecting or picking.
tty originally meant teletype and pty means pseudo-teletype. In UNIX, /dev/tty* is any device that acts like a teletype, ie, terminal. (Called teletype because that's what we had for terminals in those benighted days.) A pty is a pseudotty, a device entry that acts like a terminal to the process reading and writing there, but managed by something else.