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"odd" is also used as a crossword clue. If that's what you saw, the answer is often eccentric (9 letters).
Definitions
not easily explained
Word origin
From Middle English odde, od (“odd (not even); leftover after division into pairs”), from Old Norse oddi (“odd, third or additional number; triangle”), from oddr (“point of a weapon”), from Proto-Germanic *uzdaz (“point”), from Proto-Indo-European *wes- (“to stick, prick, pierce, sting”) + *dʰeh₁- (“to set, place”).
Used in a sentence
“She slept in, which was very odd.”
“Jena Janovy is a strange bird—a college basketball player who is a) female and b) short (5 feet 3 inches) and, perhaps oddest of all, lets neither of those things dampen her rabid enthusiasm for the game.”
“Did Mary (I thought it was odd that they always called her Mary even though her name was Mary Anne, and odder that Mom refused to correct them) have time for some questions?”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer8 curated clues
01“Left over after pairing”3 letters
02“Not divisible by two”3 letters
03“Not regular”3 letters
04“Strange or uneven”3 letters
05“Strange or unusual”3 letters
06“Strange, or not even”3 letters
07“Uneven, numerically”3 letters
08“Unusual”3 letters
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