Etymology
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Words related to bay

bawl (v.)
mid-15c., "to howl like a dog," from Old Norse baula "to low like a cow," and/or Medieval Latin baulare "to bark like a dog," both echoic. Meaning "to shout loudly" attested from 1590s. To bawl (someone) out "reprimand loudly" is 1908, American English. Related: Bawled; bawling.
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at bay (prep.)
late 14c., originally often at the bay; see bay (n.3). Figurative use, of human beings in difficulties, is from c. 1400. The expression reflects the former more widespread use of at. The earlier form of the phrase was at abai, used of hunted animals, "unable to escape," c. 1300, from French.
sick-bay (n.)
"forepart of a ship's main deck used as a hospital," 1580s, from sick (adj.) + bay (n.2), in the sense "forepart of a ship between decks, forward of the bitts, on either side," from the notion of a recessed space.
Bacchus 
Greek god of wine and revelry, a later name of Dionysus, late 15c., from Latin Bacchus, from Greek Bakkhos, perhaps related to Latin bacca "berry, fruit of a tree or shrub" (see bay (n.4)), or from an Asian language. Perhaps originally a Thracian fertility god.
baize (n.)
coarse woolen fabric with a nap on one side, dyed in plain colors, 1570s, bayse, from French baies, fem. plural of adjective bai "bay-colored" (12c.), from Latin badius "chestnut-colored" (see bay (n.4)). Thus probably so called for its original color. French plural taken as a singular in English.
bayberry (n.)
"fruit of the bay tree," 1570s, from bay (n.4) + berry. In Jamaica, the name given to a type of myrtle (Pimenta acris), 1680s, from which bay-rum (1832) is made.
abeyance (n.)
1520s, "state of expectation," from Anglo-French abeiance "suspension," also "expectation (especially in a lawsuit)," from Old French abeance "aspiration, powerful desire," noun of condition from abeer "aspire after, gape, open wide," from à "at" (see ad-) + ba(y)er "be open," from Latin *batare "to yawn, gape" (see abash).

Originally in French a legal term, "condition of a person in expectation or hope of receiving property;" it turned around in English law to mean "condition of property temporarily without an owner" (1650s). Hence "state of suspended action or existence." The French verb baer is also the source of English bay (n.2) "recessed space," as in bay window.
beagle (n.)
late 15c., begel, small type of hound formerly kept to hunt hares, of unknown origin, possibly from French becguele "noisy person," literally "gaping throat," from bayer "open wide" (see bay (n.2)) + gueule "mouth" (see gullet).
Bayard (n.)
generic or mock-heroic name for a horse, mid-14c., from Old French Baiard, name of the bay-colored magic steed given by Charlemagne to Renaud in the legends, from Old French baiart "bay-colored" (see bay (adj.)). Also by early 14c. proverbial as a blind person or thing, for now-unknown reasons.

The name later was used attributively of gentlemen of exceptional courage and integrity, in this sense from Pierre du Terrail, seigneur de Bayard (1473-1524), French knight celebrated as Chevalier sans peur et sans reproche. The surname is perhaps in reference to hair color.