Lexis meaning ‘word, phrase’ (hence lexicos ‘having to do with words’) and logos

Ex: friendly fire – огонь по своим в Ираке
collateral damages – побочные потери
surgical fire – огонь по определенным объектам
2. The morphological structure of the word. Morphemes and allomorphs. The morphological meaning of the word.

Morphology studies the composition of derived words.

A great many words have a composite nature and are made up of smaller units, each possessing sound-form and meaning. These are generally referred to as morphemes defined as the smallest indivisible two-facet language units.
If viewed structurally, words appear to be divisible into smaller units which are called morphemes. Morphemes do not occur as free forms but only as constituents of words. Yet they possess meanings of their own.
Morpheme – smallest non-segmentable meaningful unit of L.
Ex. to teach – teacher
drill - driller
Morphemes cannot be segmented into smaller units without losing their constitutive essence, i.e. two-facetness, association of a certain meaning with a given sound-pattern.
All morphemes are subdivided into two large classes: roots (or radicals) and affixes. The latter, in their turn, fall into prefixes which precede the root in the structure of the word (as in re-read, mis-pronounce, unwell) and suffixes which follow the root (as in teach-er, cur-able, diet-ate).
Words which consist of a root and an affix (or several affixes) are called derived words or derivatives and are produced by the process of word-building known as affixation (or derivation).

Identification of morphemes in various texts shows that morphemes may have different phonemic shapes.

Ex. please[pli:z] , pleasing [pli:z], pleasure [plez], pleasant[plez]
scholar – school
private – privacy
number – numerous