Allen and Greenough's New Latin Grammar for Schools and Colleges
J. B. Greenough, G. L. Kittredge, A. A. Howard, Benj. L. D'Ooge, Ed.

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[*] 266. In many apparent compounds, complete words—not stems—have grown together in speech. These are not strictly compounds in the etymological sense. They are called Syntactic Compounds. Examples are:—

[*] a. Compounds of faciō , factō , with an actual or formerly existing nounstem confounded with a verbal stem in ē-. These are causative in force.

1. cōnsuē-faciō, habituate (cf. cōnsuē-scō, become accustomed).
2. cale-faciō, cale-factō, to heat (cf. calē-scō, grow warm).

[*] b. An adverb or noun combined with a verb:—

1. bene-dīcō (bene, well, dīcō, speak), to bless.
2. satis-faciō (satis, enough, faciō, do), to do enough (for).

[*] c. Many apparent compounds of stems:—

1. fide-iubeō (fide, surety, iubeō, command), to give surety.
2. mān-suētus (manuī, to the hand, suētus, accustomed), tame.
3. Mārci-por ( Mārcī puer ), slave of Marcus.
4. Iuppiter (†Iū, old vocative, and pater), father Jove.
5. anim-advertō ( animum advertō ), attend to, punish.

[*] d. A few phrases forced into the ordinary inflections of nouns:—

1. prō-cōnsul, proconsul (for prō cōnsule, instead of a consul).
2. trium-vir, triumvir (singular from trium virōrum ).
3. septen-triō, the Bear, a constellation (supposed singular of septem triōnēs, the Seven Plough-Oxen).

In all these cases it is to be observed that words, not stems, are united.