Word Unit: a-, ab-, abs- (Latin: prefix; from, away, away from)
Word Unit: a-, an- (Greek: prefix; no, absence of, without, lack of; not)
Word Unit: a, an: Grammatical Articles (confusion exists about usage of "a" and "an" in front of other words)
Word Unit: ab- aΩ (Latin: prefix; indicating electromagnetic units of the centimeter-gram-second system)
Word Unit: abacus (Hebrew > Greek > Latin > Middle English: dust)
Word Unit: abdomin-, abdomino-, abdomen- (Latin: belly, venter [the use of "stomach" is considered incorrect for this root word]; from Latin abdo-, to put away)
Word Unit: -ability (Latin: suffix; expressing ability, capacity, fitness, or "that which may be easily handled or managed")
Word Unit: -able (Latin: suffix; expressing capacity, fitness to do that which can be handled or managed, suitable skills to accomplish something; capable of being done, something which can be finished, etc.)
Word Unit: Ablutions or Bathing, Historical Perspectives (Latin: abluere, to wash away)
Word Unit: -ably (Latin: suffix; able manner, capably)
Word Unit: abort-, aborti- (Latin: miscarry, pass away, perish by an untimely birth)

Related "birth, born, childbirth, offspring" words: feto-; lochio-; nasc-, nat-; proli-; toco-, toko-.

Word Unit: aboulo-, aboul-, abulo-, abul- (Greek: irresolution, indecision, loss or defect of the ability to make decisions)
Word Unit: About English Words (history of how, when, and why hundreds of words have entered the English language)
Word Unit: abysso-, abyss-, abys- (Greek > Latin: Greek [abussoz], a-, "no" plus bussos, "bottom" through Latin [abyssus], "no bottom, bottomless")

Inter-related cross references, directly or indirectly, involving the "sea" and the "ocean" bodies of water: Atlantic; batho-, bathy- (depth); bentho- (deep, depth); halio-, halo- (salt or "the sea"); mare, mari- (sea); necto-, nekto- (swimming); oceano-; pelago- (sea, ocean); plankto- (drifting); thalasso- (sea, ocean).

Word Unit: -ac (Greek > Latin: suffix; from French -aque, or directly from Latin -acus, from Greek -akos forming adjectives. This suffix was used to form names of arts and sciences in Greek and it is now generally used to form new names of sciences in English; meanings, "related to, of the nature of, pertaining to, referring to")
Word Unit: academ- (Greek > Latin: [originally, Academus/Akademus, a name of a hero in Greek mythology; then it became a gymnasium near Athens where Plato taught])
Word Unit: acantho-, acanth-, -acanth, -acanths, -acanthid, -acanthous (Greek: used either as a prefix or as a suffix; pointed appendages; spine, spiny; thorn, thorny)
Word Unit: acaro-, acar-, acari-, acarin- (Greek > Latin: "tiny spider", mite[s] "itch"; ticks)

Cross references of word families that are related directly, or indirectly, to: "spider; arachnoidea": arachno-; arano-; mite, mites.

Word Unit: accipit- (Latin: bird of prey, a hawk; hawk-like)
Word Unit: -aceous, -acea, -aceae, -aceaen, -aceus (Latin: a suffix; having the quality of, of the nature of, characterized by, belonging to, resembling)